diff --git a/blocks/text.js b/blocks/text.js
index f3c8def6a..afe8f253b 100644
--- a/blocks/text.js
+++ b/blocks/text.js
@@ -689,3 +689,90 @@ Blockly.Blocks['text_prompt'] = {
   mutationToDom: Blockly.Blocks['text_prompt_ext'].mutationToDom,
   domToMutation: Blockly.Blocks['text_prompt_ext'].domToMutation
 };
+
+Blockly.Blocks['text_count'] = {
+  /**
+   * Block for counting how many times one string appears within another string.
+   * @this Blockly.Block
+   */
+  init: function() {
+    this.jsonInit({
+      "message0": Blockly.Msg.TEXT_COUNT_MESSAGE0,
+      "args0": [
+        {
+          "type": "input_value",
+          "name": "SUB",
+          "check": "String"
+        },
+        {
+          "type": "input_value",
+          "name": "TEXT",
+          "check": "String"
+        }
+      ],
+      "output": "Number",
+      "inputsInline": true,
+      "colour": Blockly.Blocks.math.HUE,
+      "tooltip": Blockly.Msg.TEXT_COUNT_TOOLTIP,
+      "helpUrl": Blockly.Msg.TEXT_COUNT_HELPURL
+    });
+  }
+};
+
+Blockly.Blocks['text_replace'] = {
+  /**
+   * Block for replacing one string with another in the text.
+   * @this Blockly.Block
+   */
+  init: function() {
+    this.jsonInit({
+      "message0": Blockly.Msg.TEXT_REPLACE_MESSAGE0,
+      "args0": [
+        {
+          "type": "input_value",
+          "name": "FROM",
+          "check": "String"
+        },
+        {
+          "type": "input_value",
+          "name": "TO",
+          "check": "String"
+        },
+        {
+          "type": "input_value",
+          "name": "TEXT",
+          "check": "String"
+        },
+      ],
+      "output": "String",
+      "inputsInline": true,
+      "colour": Blockly.Blocks.texts.HUE,
+      "tooltip": Blockly.Msg.TEXT_REPLACE_TOOLTIP,
+      "helpUrl": Blockly.Msg.TEXT_REPLACE_HELPURL
+    });
+  }
+};
+
+Blockly.Blocks['text_reverse'] = {
+  /**
+   * Block for reversing a string.
+   * @this Blockly.Block
+   */
+  init: function() {
+    this.jsonInit({
+      "message0": Blockly.Msg.TEXT_REVERSE_MESSAGE0,
+      "args0": [
+        {
+          "type": "input_value",
+          "name": "TEXT",
+          "check": "String"
+        },
+      ],
+      "output": "String",
+      "inputsInline": true,
+      "colour": Blockly.Blocks.texts.HUE,
+      "tooltip": Blockly.Msg.TEXT_REVERSE_TOOLTIP,
+      "helpUrl": Blockly.Msg.TEXT_REVERSE_HELPURL
+    });
+  }
+};
diff --git a/generators/dart/text.js b/generators/dart/text.js
index 47660d3bd..94c60f74b 100644
--- a/generators/dart/text.js
+++ b/generators/dart/text.js
@@ -295,3 +295,53 @@ Blockly.Dart['text_prompt_ext'] = function(block) {
 };
 
 Blockly.Dart['text_prompt'] = Blockly.Dart['text_prompt_ext'];
+
+Blockly.Dart['text_count'] = function(block) {
+  var text = Blockly.Dart.valueToCode(block, 'TEXT',
+      Blockly.Dart.ORDER_UNARY_POSTFIX) || '\'\'';
+  var sub = Blockly.Dart.valueToCode(block, 'SUB',
+      Blockly.Dart.ORDER_NONE) || '\'\'';
+  // Substring count is not a native Dart function.  Define one.
+  var functionName = Blockly.Dart.provideFunction_(
+      'text_count',
+      ['int ' + Blockly.Dart.FUNCTION_NAME_PLACEHOLDER_ +
+        '(String haystack, String needle) {',
+        '  if (needle.length == 0) {',
+        '    return haystack.length + 1;',
+        '  }',
+        '  int index = 0;',
+        '  int count = 0;',
+        '  while (index != -1) {',
+        '    index = haystack.indexOf(needle, index);',
+        '    if (index != -1) {',
+        '      count++;',
+        '     index += needle.length;',
+        '    }',
+        '  }',
+        '  return count;',
+        '}']);
+  var code = functionName + '(' + text + ', ' + sub + ')';
+  return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
+};
+
+Blockly.Dart['text_replace'] = function(block) {
+  var text = Blockly.Dart.valueToCode(block, 'TEXT',
+      Blockly.Dart.ORDER_UNARY_POSTFIX) || '\'\'';
+  var from = Blockly.Dart.valueToCode(block, 'FROM',
+      Blockly.Dart.ORDER_NONE) || '\'\'';
+  var to = Blockly.Dart.valueToCode(block, 'TO',
+      Blockly.Dart.ORDER_NONE) || '\'\'';
+  var code = text + '.replaceAll(' + from + ', ' + to + ')';
+  return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
+};
+
+Blockly.Dart['text_reverse'] = function(block) {
+  // There isn't a sensible way to do this in Dart. See:
+  // http://stackoverflow.com/a/21613700/3529104
+  // Implementing something is possibly better than not implementing anything?
+  var text = Blockly.Dart.valueToCode(block, 'TEXT',
+      Blockly.Dart.ORDER_UNARY_POSTFIX) || '\'\'';
+  var code = 'new String.fromCharCodes(' + text + '.runes.toList().reversed)';
+  // XXX What should the operator precedence be for a `new`?
+  return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
+};
diff --git a/generators/javascript/text.js b/generators/javascript/text.js
index 3a229dc00..9e2a375a2 100644
--- a/generators/javascript/text.js
+++ b/generators/javascript/text.js
@@ -302,3 +302,51 @@ Blockly.JavaScript['text_prompt_ext'] = function(block) {
 };
 
 Blockly.JavaScript['text_prompt'] = Blockly.JavaScript['text_prompt_ext'];
+
+Blockly.JavaScript['text_count'] = function(block) {
+  var text = Blockly.JavaScript.valueToCode(block, 'TEXT',
+      Blockly.JavaScript.ORDER_MEMBER) || '\'\'';
+  var sub = Blockly.JavaScript.valueToCode(block, 'SUB',
+      Blockly.JavaScript.ORDER_NONE) || '\'\'';
+  var functionName = Blockly.JavaScript.provideFunction_(
+      'textCount',
+      ['function ' + Blockly.JavaScript.FUNCTION_NAME_PLACEHOLDER_ +
+          '(haystack, needle) {',
+       '  if (needle.length === 0) {',
+       '    return haystack.length + 1;',
+       '  } else {',
+       '    return haystack.split(needle).length - 1;',
+       '  }',
+       '}']);
+  var code = functionName + '(' + text + ', ' + sub + ')';
+  return [code, Blockly.JavaScript.ORDER_SUBTRACTION];
+};
+
+Blockly.JavaScript['text_replace'] = function(block) {
+  var text = Blockly.JavaScript.valueToCode(block, 'TEXT',
+      Blockly.JavaScript.ORDER_MEMBER) || '\'\'';
+  var from = Blockly.JavaScript.valueToCode(block, 'FROM',
+      Blockly.JavaScript.ORDER_NONE) || '\'\'';
+  var to = Blockly.JavaScript.valueToCode(block, 'TO',
+      Blockly.JavaScript.ORDER_NONE) || '\'\'';
+  // The regex escaping code below is taken from the implementation of
+  // goog.string.regExpEscape.
+  var functionName = Blockly.JavaScript.provideFunction_(
+      'textReplace',
+      ['function ' + Blockly.JavaScript.FUNCTION_NAME_PLACEHOLDER_ +
+          '(haystack, needle, replacement) {',
+       '  needle = ' +
+           'needle.replace(/([-()\\[\\]{}+?*.$\\^|,:#<!\\\\])/g,"\\\\$1")',
+       '                 .replace(/\\x08/g,"\\\\x08");',
+       '  return haystack.replace(new RegExp(needle, \'g\'), replacement);',
+       '}']);
+  var code = functionName + '(' + text + ', ' + from + ', ' + to + ')';
+  return [code, Blockly.JavaScript.ORDER_MEMBER];
+};
+
+Blockly.JavaScript['text_reverse'] = function(block) {
+  var text = Blockly.JavaScript.valueToCode(block, 'TEXT',
+      Blockly.JavaScript.ORDER_MEMBER) || '\'\'';
+  var code = text + '.split(\'\').reverse().join(\'\')';
+  return [code, Blockly.JavaScript.ORDER_MEMBER];
+};
diff --git a/generators/lua/text.js b/generators/lua/text.js
index 74efba4a2..8a2ac914a 100644
--- a/generators/lua/text.js
+++ b/generators/lua/text.js
@@ -292,3 +292,70 @@ Blockly.Lua['text_prompt_ext'] = function(block) {
 };
 
 Blockly.Lua['text_prompt'] = Blockly.Lua['text_prompt_ext'];
+
+Blockly.Lua['text_count'] = function(block) {
+  var text = Blockly.Lua.valueToCode(block, 'TEXT',
+      Blockly.Lua.ORDER_NONE) || '\'\'';
+  var sub = Blockly.Lua.valueToCode(block, 'SUB',
+      Blockly.Lua.ORDER_NONE) || '\'\'';
+  var functionName = Blockly.Lua.provideFunction_(
+      'text_count',
+      ['function ' + Blockly.Lua.FUNCTION_NAME_PLACEHOLDER_
+        + '(haystack, needle)',
+        '  if #needle == 0 then',
+        '    return #haystack + 1',
+        '  end',
+        '  local i = 1',
+        '  local count = 0',
+        '  while true do',
+        '    i = string.find(haystack, needle, i, true)',
+        '    if i == nil then',
+        '      break',
+        '    end',
+        '    count = count + 1',
+        '    i = i + #needle',
+        '  end',
+        '  return count',
+        'end',
+      ]);
+  var code = functionName + '(' + text + ', ' + sub + ')';
+  return [code, Blockly.Lua.ORDER_HIGH];
+};
+
+Blockly.Lua['text_replace'] = function(block) {
+  var text = Blockly.Lua.valueToCode(block, 'TEXT',
+      Blockly.Lua.ORDER_NONE) || '\'\'';
+  var from = Blockly.Lua.valueToCode(block, 'FROM',
+      Blockly.Lua.ORDER_NONE) || '\'\'';
+  var to = Blockly.Lua.valueToCode(block, 'TO',
+      Blockly.Lua.ORDER_NONE) || '\'\'';
+  var functionName = Blockly.Lua.provideFunction_(
+      'text_replace',
+      ['function ' + Blockly.Lua.FUNCTION_NAME_PLACEHOLDER_
+        + '(haystack, needle, replacement)',
+        '  local buf = {}',
+        '  local i = 1',
+        '  while i <= #haystack do',
+        '    if string.sub(haystack, i, i + #needle - 1) == needle then',
+        '      for j = 1, #replacement do',
+        '        table.insert(buf, string.sub(replacement, j, j))',
+        '      end',
+        '      i = i + #needle',
+        '    else',
+        '      table.insert(buf, string.sub(haystack, i, i))',
+        '      i = i + 1',
+        '    end',
+        '  end',
+        '  return table.concat(buf)',
+        'end',
+      ]);
+  var code = functionName + '(' + text + ', ' + from + ', ' + to + ')';
+  return [code, Blockly.Lua.ORDER_HIGH];
+};
+
+Blockly.Lua['text_reverse'] = function(block) {
+  var text = Blockly.Lua.valueToCode(block, 'TEXT',
+      Blockly.Lua.ORDER_HIGH) || '\'\'';
+  var code = 'string.reverse(' + text + ')';
+  return [code, Blockly.Lua.ORDER_HIGH];
+};
diff --git a/generators/php/text.js b/generators/php/text.js
index ba25cd81b..7903d31e7 100644
--- a/generators/php/text.js
+++ b/generators/php/text.js
@@ -248,3 +248,32 @@ Blockly.PHP['text_prompt_ext'] = function(block) {
 };
 
 Blockly.PHP['text_prompt'] = Blockly.PHP['text_prompt_ext'];
+
+Blockly.PHP['text_count'] = function(block) {
+  var text = Blockly.PHP.valueToCode(block, 'TEXT',
+      Blockly.PHP.ORDER_MEMBER) || '\'\'';
+  var sub = Blockly.PHP.valueToCode(block, 'SUB',
+      Blockly.PHP.ORDER_NONE) || '\'\'';
+  var code = 'strlen(' + sub + ') === 0'
+    + ' ? strlen(' + text + ') + 1'
+    + ' : substr_count(' + text + ', ' + sub + ')';
+  return [code, Blockly.PHP.ORDER_CONDITIONAL];
+};
+
+Blockly.PHP['text_replace'] = function(block) {
+  var text = Blockly.PHP.valueToCode(block, 'TEXT',
+      Blockly.PHP.ORDER_MEMBER) || '\'\'';
+  var from = Blockly.PHP.valueToCode(block, 'FROM',
+      Blockly.PHP.ORDER_NONE) || '\'\'';
+  var to = Blockly.PHP.valueToCode(block, 'TO',
+      Blockly.PHP.ORDER_NONE) || '\'\'';
+  var code = 'str_replace(' + from + ', ' + to + ', ' + text + ')';
+  return [code, Blockly.PHP.ORDER_FUNCTION_CALL];
+};
+
+Blockly.PHP['text_reverse'] = function(block) {
+  var text = Blockly.PHP.valueToCode(block, 'TEXT',
+      Blockly.PHP.ORDER_MEMBER) || '\'\'';
+  var code = 'strrev(' + text + ')';
+  return [code, Blockly.PHP.ORDER_FUNCTION_CALL];
+};
diff --git a/generators/python/text.js b/generators/python/text.js
index cd6e35de1..0fefc77d9 100644
--- a/generators/python/text.js
+++ b/generators/python/text.js
@@ -251,3 +251,30 @@ Blockly.Python['text_prompt_ext'] = function(block) {
 };
 
 Blockly.Python['text_prompt'] = Blockly.Python['text_prompt_ext'];
+
+Blockly.Python['text_count'] = function(block) {
+  var text = Blockly.Python.valueToCode(block, 'TEXT',
+      Blockly.Python.ORDER_MEMBER) || '\'\'';
+  var sub = Blockly.Python.valueToCode(block, 'SUB',
+      Blockly.Python.ORDER_NONE) || '\'\'';
+  var code = text + '.count(' + sub + ')';
+  return [code, Blockly.Python.ORDER_MEMBER];
+};
+
+Blockly.Python['text_replace'] = function(block) {
+  var text = Blockly.Python.valueToCode(block, 'TEXT',
+      Blockly.Python.ORDER_MEMBER) || '\'\'';
+  var from = Blockly.Python.valueToCode(block, 'FROM',
+      Blockly.Python.ORDER_NONE) || '\'\'';
+  var to = Blockly.Python.valueToCode(block, 'TO',
+      Blockly.Python.ORDER_NONE) || '\'\'';
+  var code = text + '.replace(' + from + ', ' + to + ')';
+  return [code, Blockly.Python.ORDER_MEMBER];
+};
+
+Blockly.Python['text_reverse'] = function(block) {
+  var text = Blockly.Python.valueToCode(block, 'TEXT',
+      Blockly.Python.ORDER_MEMBER) || '\'\'';
+  var code = text + '[::-1]';
+  return [code, Blockly.Python.ORDER_MEMBER];
+};
diff --git a/msg/json/en.json b/msg/json/en.json
index 1f5625dd6..486819e64 100644
--- a/msg/json/en.json
+++ b/msg/json/en.json
@@ -1,7 +1,7 @@
 {
 	"@metadata": {
 		"author": "Ellen Spertus <ellen.spertus@gmail.com>",
-		"lastupdated": "2017-01-12 13:53:04.889198",
+		"lastupdated": "2017-01-18 10:58:30.631169",
 		"locale": "en",
 		"messagedocumentation" : "qqq"
 	},
@@ -253,6 +253,15 @@
 	"TEXT_PROMPT_TYPE_NUMBER": "prompt for number with message",
 	"TEXT_PROMPT_TOOLTIP_NUMBER": "Prompt for user for a number.",
 	"TEXT_PROMPT_TOOLTIP_TEXT": "Prompt for user for some text.",
+	"TEXT_COUNT_MESSAGE0": "count %1 in %2",
+	"TEXT_COUNT_HELPURL": "",
+	"TEXT_COUNT_TOOLTIP": "Count how many times a string occurs in another string.",
+	"TEXT_REPLACE_MESSAGE0": "replace %1 with %2 in %3",
+	"TEXT_REPLACE_HELPURL": "",
+	"TEXT_REPLACE_TOOLTIP": "Replace a string within another string.",
+	"TEXT_REVERSE_MESSAGE0": "reverse %1",
+	"TEXT_REVERSE_HELPURL": "",
+	"TEXT_REVERSE_TOOLTIP": "Reverses the characters in a string.",
 	"LISTS_CREATE_EMPTY_HELPURL": "https://github.com/google/blockly/wiki/Lists#create-empty-list",
 	"LISTS_CREATE_EMPTY_TITLE": "create empty list",
 	"LISTS_CREATE_EMPTY_TOOLTIP": "Returns a list, of length 0, containing no data records",
diff --git a/msg/json/qqq.json b/msg/json/qqq.json
index dbb69c7cb..d37228ff9 100644
--- a/msg/json/qqq.json
+++ b/msg/json/qqq.json
@@ -1,11 +1,4 @@
 {
-	"@metadata": {
-		"authors": [
-			"Espertus",
-			"Liuxinyu970226",
-			"Shirayuki"
-		]
-	},
 	"VARIABLES_DEFAULT_NAME": "default name - A simple, general default name for a variable, preferably short. For more context, see [[Translating:Blockly#infrequent_message_types]].\n{{Identical|Item}}",
 	"TODAY": "button text - Button that sets a calendar to today's date.\n{{Identical|Today}}",
 	"DUPLICATE_BLOCK": "context menu - Make a copy of the selected block (and any blocks it contains).\n{{Identical|Duplicate}}",
@@ -254,6 +247,15 @@
 	"TEXT_PROMPT_TYPE_NUMBER": "dropdown - Specifies that a number should be requested from the user with the following message.  See [https://github.com/google/blockly/wiki/Text#printing-text https://github.com/google/blockly/wiki/Text#printing-text].",
 	"TEXT_PROMPT_TOOLTIP_NUMBER": "dropdown - Precedes the message with which the user should be prompted for a number.  See [https://github.com/google/blockly/wiki/Text#printing-text https://github.com/google/blockly/wiki/Text#printing-text].",
 	"TEXT_PROMPT_TOOLTIP_TEXT": "dropdown - Precedes the message with which the user should be prompted for some text. See [https://github.com/google/blockly/wiki/Text#printing-text https://github.com/google/blockly/wiki/Text#printing-text].",
+	"TEXT_COUNT_MESSAGE0": "message0 interpolation string",
+	"TEXT_COUNT_HELPURL": "url - Information about counting how many times a string appears in another string.",
+	"TEXT_COUNT_TOOLTIP": "tooltip - See [https://github.com/google/blockly/wiki/Text#printing-text https://github.com/google/blockly/wiki/Text#printing-text].",
+	"TEXT_REPLACE_MESSAGE0": "message0 interpolation string",
+	"TEXT_REPLACE_HELPURL": "url - Information about replacing a string within another string.",
+	"TEXT_REPLACE_TOOLTIP": "tooltip - See [https://github.com/google/blockly/wiki/Text#printing-text https://github.com/google/blockly/wiki/Text#printing-text].",
+	"TEXT_REVERSE_MESSAGE0": "message0 interpolation string",
+	"TEXT_REVERSE_HELPURL": "url - Information about reversing a string.",
+	"TEXT_REVERSE_TOOLTIP": "tooltip - See [https://github.com/google/blockly/wiki/Text#printing-text https://github.com/google/blockly/wiki/Text#printing-text].",
 	"LISTS_CREATE_EMPTY_HELPURL": "url - Information on empty lists.",
 	"LISTS_CREATE_EMPTY_TITLE": "block text - See [https://github.com/google/blockly/wiki/Lists#create-empty-list https://github.com/google/blockly/wiki/Lists#create-empty-list].",
 	"LISTS_CREATE_EMPTY_TOOLTIP": "block text - See [https://github.com/google/blockly/wiki/Lists#create-empty-list https://github.com/google/blockly/wiki/Lists#create-empty-list].",
diff --git a/msg/messages.js b/msg/messages.js
index 24fc1fa14..a11c62d6c 100644
--- a/msg/messages.js
+++ b/msg/messages.js
@@ -766,6 +766,30 @@ Blockly.Msg.TEXT_PROMPT_TOOLTIP_NUMBER = 'Prompt for user for a number.';
 /// https://github.com/google/blockly/wiki/Text#printing-text].
 Blockly.Msg.TEXT_PROMPT_TOOLTIP_TEXT = 'Prompt for user for some text.';
 
+/// block text - Title of a block that counts the number of instances of
+/// a smaller pattern (%1) inside a longer string (%2).
+Blockly.Msg.TEXT_COUNT_MESSAGE0 = 'count %1 in %2';
+/// url - Information about counting how many times a string appears in another string.
+Blockly.Msg.TEXT_COUNT_HELPURL = 'https://github.com/google/blockly/wiki/Text#counting-substrings';
+/// tooltip - Short description of a block that counts how many times some text occurs within some other text.
+Blockly.Msg.TEXT_COUNT_TOOLTIP = 'Count how many times some text occurs within some other text.';
+
+/// block text - Title of a block that returns a copy of text (%3) with all
+/// instances of some smaller text (%1) replaced with other text (%2).
+Blockly.Msg.TEXT_REPLACE_MESSAGE0 = 'replace %1 with %2 in %3';
+/// url - Information about replacing each copy text (or string, in computer lingo) with other text.
+Blockly.Msg.TEXT_REPLACE_HELPURL = 'https://github.com/google/blockly/wiki/Text#replacing-substrings';
+/// tooltip - Short description of a block that replaces copies of text in a large text with other text.
+Blockly.Msg.TEXT_REPLACE_TOOLTIP = 'Replace all occurances of some text within some other text.';
+
+/// block text - Title of block that returns a copy of text (%1) with the order
+/// of letters and characters reversed.
+Blockly.Msg.TEXT_REVERSE_MESSAGE0 = 'reverse %1';
+/// url - Information about reversing a letters/characters in text.
+Blockly.Msg.TEXT_REVERSE_HELPURL = 'https://github.com/google/blockly/wiki/Text#reversing-text';
+/// tooltip - See [https://github.com/google/blockly/wiki/Text].
+Blockly.Msg.TEXT_REVERSE_TOOLTIP = 'Reverses the order of the characters in the text.';
+
 // Lists Blocks.
 /// url - Information on empty lists.
 Blockly.Msg.LISTS_CREATE_EMPTY_HELPURL = 'https://github.com/google/blockly/wiki/Lists#create-empty-list';
diff --git a/tests/generators/index.html b/tests/generators/index.html
index 3f905b698..af802f2a9 100644
--- a/tests/generators/index.html
+++ b/tests/generators/index.html
@@ -280,6 +280,9 @@ h1 {
       <block type="text_trim"></block>
       <block type="text_print"></block>
       <block type="text_prompt_ext"></block>
+      <block type="text_count"></block>
+      <block type="text_replace"></block>
+      <block type="text_reverse"></block>
     </category>
     <category name="Lists" colour="260">
       <block type="lists_create_empty"></block>
diff --git a/tests/generators/text.xml b/tests/generators/text.xml
index baf62d80f..32887ec93 100644
--- a/tests/generators/text.xml
+++ b/tests/generators/text.xml
@@ -1,5 +1,5 @@
 <xml xmlns="http://www.w3.org/1999/xhtml">
-  <block type="unittest_main" x="13" y="13">
+  <block type="unittest_main" x="13" y="-63">
     <statement name="DO">
       <block type="procedures_callnoreturn">
         <mutation name="test length"></mutation>
@@ -36,6 +36,21 @@
                                                 <next>
                                                   <block type="procedures_callnoreturn">
                                                     <mutation name="test trim"></mutation>
+                                                    <next>
+                                                      <block type="procedures_callnoreturn">
+                                                        <mutation name="test count"></mutation>
+                                                        <next>
+                                                          <block type="procedures_callnoreturn">
+                                                            <mutation name="test reverse"></mutation>
+                                                            <next>
+                                                              <block type="procedures_callnoreturn">
+                                                                <mutation name="test replace"></mutation>
+                                                              </block>
+                                                            </next>
+                                                          </block>
+                                                        </next>
+                                                      </block>
+                                                    </next>
                                                   </block>
                                                 </next>
                                               </block>
@@ -4091,4 +4106,545 @@
       </block>
     </statement>
   </block>
+  <block type="procedures_defnoreturn" x="13" y="12088">
+    <field name="NAME">test count</field>
+    <comment pinned="false" h="80" w="160">Tests the "trim" block.</comment>
+    <statement name="STACK">
+      <block type="variables_set">
+        <field name="VAR">text</field>
+        <value name="VALUE">
+          <block type="text">
+            <field name="TEXT">woolloomooloo</field>
+          </block>
+        </value>
+        <next>
+          <block type="unittest_assertequals" inline="false">
+            <value name="MESSAGE">
+              <block type="text">
+                <field name="TEXT">len 1</field>
+              </block>
+            </value>
+            <value name="ACTUAL">
+              <block type="text_count">
+                <value name="SUB">
+                  <block type="text">
+                    <field name="TEXT">o</field>
+                  </block>
+                </value>
+                <value name="TEXT">
+                  <block type="variables_get">
+                    <field name="VAR">text</field>
+                  </block>
+                </value>
+              </block>
+            </value>
+            <value name="EXPECTED">
+              <block type="math_number">
+                <field name="NUM">8</field>
+              </block>
+            </value>
+            <next>
+              <block type="unittest_assertequals" inline="false">
+                <value name="MESSAGE">
+                  <block type="text">
+                    <field name="TEXT">len 2</field>
+                  </block>
+                </value>
+                <value name="ACTUAL">
+                  <block type="text_count">
+                    <value name="SUB">
+                      <block type="text">
+                        <field name="TEXT">oo</field>
+                      </block>
+                    </value>
+                    <value name="TEXT">
+                      <block type="variables_get">
+                        <field name="VAR">text</field>
+                      </block>
+                    </value>
+                  </block>
+                </value>
+                <value name="EXPECTED">
+                  <block type="math_number">
+                    <field name="NUM">4</field>
+                  </block>
+                </value>
+                <next>
+                  <block type="unittest_assertequals" inline="false">
+                    <value name="MESSAGE">
+                      <block type="text">
+                        <field name="TEXT">len 3</field>
+                      </block>
+                    </value>
+                    <value name="ACTUAL">
+                      <block type="text_count">
+                        <value name="SUB">
+                          <block type="text">
+                            <field name="TEXT">loo</field>
+                          </block>
+                        </value>
+                        <value name="TEXT">
+                          <block type="variables_get">
+                            <field name="VAR">text</field>
+                          </block>
+                        </value>
+                      </block>
+                    </value>
+                    <value name="EXPECTED">
+                      <block type="math_number">
+                        <field name="NUM">2</field>
+                      </block>
+                    </value>
+                    <next>
+                      <block type="unittest_assertequals" inline="false">
+                        <value name="MESSAGE">
+                          <block type="text">
+                            <field name="TEXT">start</field>
+                          </block>
+                        </value>
+                        <value name="ACTUAL">
+                          <block type="text_count">
+                            <value name="SUB">
+                              <block type="text">
+                                <field name="TEXT">wool</field>
+                              </block>
+                            </value>
+                            <value name="TEXT">
+                              <block type="variables_get">
+                                <field name="VAR">text</field>
+                              </block>
+                            </value>
+                          </block>
+                        </value>
+                        <value name="EXPECTED">
+                          <block type="math_number">
+                            <field name="NUM">1</field>
+                          </block>
+                        </value>
+                        <next>
+                          <block type="unittest_assertequals" inline="false">
+                            <value name="MESSAGE">
+                              <block type="text">
+                                <field name="TEXT">missing</field>
+                              </block>
+                            </value>
+                            <value name="ACTUAL">
+                              <block type="text_count">
+                                <value name="SUB">
+                                  <block type="text">
+                                    <field name="TEXT">chicken</field>
+                                  </block>
+                                </value>
+                                <value name="TEXT">
+                                  <block type="variables_get">
+                                    <field name="VAR">text</field>
+                                  </block>
+                                </value>
+                              </block>
+                            </value>
+                            <value name="EXPECTED">
+                              <block type="math_number">
+                                <field name="NUM">0</field>
+                              </block>
+                            </value>
+                            <next>
+                              <block type="unittest_assertequals" inline="false">
+                                <value name="MESSAGE">
+                                  <block type="text">
+                                    <field name="TEXT">empty needle</field>
+                                  </block>
+                                </value>
+                                <value name="ACTUAL">
+                                  <block type="text_count">
+                                    <value name="SUB">
+                                      <block type="text">
+                                        <field name="TEXT"></field>
+                                      </block>
+                                    </value>
+                                    <value name="TEXT">
+                                      <block type="variables_get">
+                                        <field name="VAR">text</field>
+                                      </block>
+                                    </value>
+                                  </block>
+                                </value>
+                                <value name="EXPECTED">
+                                  <block type="math_number">
+                                    <field name="NUM">14</field>
+                                  </block>
+                                </value>
+                                <next>
+                                  <block type="unittest_assertequals" inline="false">
+                                    <value name="MESSAGE">
+                                      <block type="text">
+                                        <field name="TEXT">empty source</field>
+                                      </block>
+                                    </value>
+                                    <value name="ACTUAL">
+                                      <block type="text_count">
+                                        <value name="SUB">
+                                          <block type="text">
+                                            <field name="TEXT">chicken</field>
+                                          </block>
+                                        </value>
+                                        <value name="TEXT">
+                                          <block type="text">
+                                            <field name="TEXT"></field>
+                                          </block>
+                                        </value>
+                                      </block>
+                                    </value>
+                                    <value name="EXPECTED">
+                                      <block type="math_number">
+                                        <field name="NUM">0</field>
+                                      </block>
+                                    </value>
+                                  </block>
+                                </next>
+                              </block>
+                            </next>
+                          </block>
+                        </next>
+                      </block>
+                    </next>
+                  </block>
+                </next>
+              </block>
+            </next>
+          </block>
+        </next>
+      </block>
+    </statement>
+  </block>
+  <block type="procedures_defnoreturn" x="12" y="12812">
+    <field name="NAME">test reverse</field>
+    <comment pinned="false" h="80" w="160">Tests the "trim" block.</comment>
+    <statement name="STACK">
+      <block type="unittest_assertequals" inline="false">
+        <value name="MESSAGE">
+          <block type="text">
+            <field name="TEXT">empty string</field>
+          </block>
+        </value>
+        <value name="ACTUAL">
+          <block type="text_reverse">
+            <value name="TEXT">
+              <block type="text">
+                <field name="TEXT"></field>
+              </block>
+            </value>
+          </block>
+        </value>
+        <value name="EXPECTED">
+          <block type="text">
+            <field name="TEXT"></field>
+          </block>
+        </value>
+        <next>
+          <block type="unittest_assertequals" inline="false">
+            <value name="MESSAGE">
+              <block type="text">
+                <field name="TEXT">len 1</field>
+              </block>
+            </value>
+            <value name="ACTUAL">
+              <block type="text_reverse">
+                <value name="TEXT">
+                  <block type="text">
+                    <field name="TEXT">a</field>
+                  </block>
+                </value>
+              </block>
+            </value>
+            <value name="EXPECTED">
+              <block type="text">
+                <field name="TEXT">a</field>
+              </block>
+            </value>
+            <next>
+              <block type="unittest_assertequals" inline="false">
+                <value name="MESSAGE">
+                  <block type="text">
+                    <field name="TEXT">len 2</field>
+                  </block>
+                </value>
+                <value name="ACTUAL">
+                  <block type="text_reverse">
+                    <value name="TEXT">
+                      <block type="text">
+                        <field name="TEXT">ab</field>
+                      </block>
+                    </value>
+                  </block>
+                </value>
+                <value name="EXPECTED">
+                  <block type="text">
+                    <field name="TEXT">ba</field>
+                  </block>
+                </value>
+                <next>
+                  <block type="unittest_assertequals" inline="false">
+                    <value name="MESSAGE">
+                      <block type="text">
+                        <field name="TEXT">longer</field>
+                      </block>
+                    </value>
+                    <value name="ACTUAL">
+                      <block type="text_reverse">
+                        <value name="TEXT">
+                          <block type="text">
+                            <field name="TEXT">woolloomooloo</field>
+                          </block>
+                        </value>
+                      </block>
+                    </value>
+                    <value name="EXPECTED">
+                      <block type="text">
+                        <field name="TEXT">ooloomoolloow</field>
+                      </block>
+                    </value>
+                  </block>
+                </next>
+              </block>
+            </next>
+          </block>
+        </next>
+      </block>
+    </statement>
+  </block>
+  <block type="procedures_defnoreturn" x="12" y="13237">
+    <field name="NAME">test replace</field>
+    <comment pinned="false" h="80" w="160">Tests the "trim" block.</comment>
+    <statement name="STACK">
+      <block type="unittest_assertequals" inline="false">
+        <value name="MESSAGE">
+          <block type="text">
+            <field name="TEXT">replace all instances 1</field>
+          </block>
+        </value>
+        <value name="ACTUAL">
+          <block type="text_replace">
+            <value name="FROM">
+              <block type="text">
+                <field name="TEXT">oo</field>
+              </block>
+            </value>
+            <value name="TO">
+              <block type="text">
+                <field name="TEXT">123</field>
+              </block>
+            </value>
+            <value name="TEXT">
+              <block type="text">
+                <field name="TEXT">woolloomooloo</field>
+              </block>
+            </value>
+          </block>
+        </value>
+        <value name="EXPECTED">
+          <block type="text">
+            <field name="TEXT">w123ll123m123l123</field>
+          </block>
+        </value>
+        <next>
+          <block type="unittest_assertequals" inline="false">
+            <value name="MESSAGE">
+              <block type="text">
+                <field name="TEXT">literal string replacement</field>
+              </block>
+            </value>
+            <value name="ACTUAL">
+              <block type="text_replace">
+                <value name="FROM">
+                  <block type="text">
+                    <field name="TEXT">.oo</field>
+                  </block>
+                </value>
+                <value name="TO">
+                  <block type="text">
+                    <field name="TEXT">X</field>
+                  </block>
+                </value>
+                <value name="TEXT">
+                  <block type="text">
+                    <field name="TEXT">woolloomooloo</field>
+                  </block>
+                </value>
+              </block>
+            </value>
+            <value name="EXPECTED">
+              <block type="text">
+                <field name="TEXT">woolloomooloo</field>
+              </block>
+            </value>
+            <next>
+              <block type="unittest_assertequals" inline="false">
+                <value name="MESSAGE">
+                  <block type="text">
+                    <field name="TEXT">not found</field>
+                  </block>
+                </value>
+                <value name="ACTUAL">
+                  <block type="text_replace">
+                    <value name="FROM">
+                      <block type="text">
+                        <field name="TEXT">abc</field>
+                      </block>
+                    </value>
+                    <value name="TO">
+                      <block type="text">
+                        <field name="TEXT">X</field>
+                      </block>
+                    </value>
+                    <value name="TEXT">
+                      <block type="text">
+                        <field name="TEXT">woolloomooloo</field>
+                      </block>
+                    </value>
+                  </block>
+                </value>
+                <value name="EXPECTED">
+                  <block type="text">
+                    <field name="TEXT">woolloomooloo</field>
+                  </block>
+                </value>
+                <next>
+                  <block type="unittest_assertequals" inline="false">
+                    <value name="MESSAGE">
+                      <block type="text">
+                        <field name="TEXT">empty replacement 1</field>
+                      </block>
+                    </value>
+                    <value name="ACTUAL">
+                      <block type="text_replace">
+                        <value name="FROM">
+                          <block type="text">
+                            <field name="TEXT">o</field>
+                          </block>
+                        </value>
+                        <value name="TO">
+                          <block type="text">
+                            <field name="TEXT"></field>
+                          </block>
+                        </value>
+                        <value name="TEXT">
+                          <block type="text">
+                            <field name="TEXT">woolloomooloo</field>
+                          </block>
+                        </value>
+                      </block>
+                    </value>
+                    <value name="EXPECTED">
+                      <block type="text">
+                        <field name="TEXT">wllml</field>
+                      </block>
+                    </value>
+                    <next>
+                      <block type="unittest_assertequals" inline="false">
+                        <value name="MESSAGE">
+                          <block type="text">
+                            <field name="TEXT">empty replacement 2</field>
+                          </block>
+                        </value>
+                        <value name="ACTUAL">
+                          <block type="text_replace">
+                            <value name="FROM">
+                              <block type="text">
+                                <field name="TEXT">aaaaa</field>
+                              </block>
+                            </value>
+                            <value name="TO">
+                              <block type="text">
+                                <field name="TEXT"></field>
+                              </block>
+                            </value>
+                            <value name="TEXT">
+                              <block type="text">
+                                <field name="TEXT">aaaaa</field>
+                              </block>
+                            </value>
+                          </block>
+                        </value>
+                        <value name="EXPECTED">
+                          <block type="text">
+                            <field name="TEXT"></field>
+                          </block>
+                        </value>
+                        <next>
+                          <block type="unittest_assertequals" inline="false">
+                            <value name="MESSAGE">
+                              <block type="text">
+                                <field name="TEXT">empty replacement 3</field>
+                              </block>
+                            </value>
+                            <value name="ACTUAL">
+                              <block type="text_replace">
+                                <value name="FROM">
+                                  <block type="text">
+                                    <field name="TEXT">a</field>
+                                  </block>
+                                </value>
+                                <value name="TO">
+                                  <block type="text">
+                                    <field name="TEXT"></field>
+                                  </block>
+                                </value>
+                                <value name="TEXT">
+                                  <block type="text">
+                                    <field name="TEXT">aaaaa</field>
+                                  </block>
+                                </value>
+                              </block>
+                            </value>
+                            <value name="EXPECTED">
+                              <block type="text">
+                                <field name="TEXT"></field>
+                              </block>
+                            </value>
+                            <next>
+                              <block type="unittest_assertequals" inline="false">
+                                <value name="MESSAGE">
+                                  <block type="text">
+                                    <field name="TEXT">empty source</field>
+                                  </block>
+                                </value>
+                                <value name="ACTUAL">
+                                  <block type="text_replace">
+                                    <value name="FROM">
+                                      <block type="text">
+                                        <field name="TEXT">a</field>
+                                      </block>
+                                    </value>
+                                    <value name="TO">
+                                      <block type="text">
+                                        <field name="TEXT">chicken</field>
+                                      </block>
+                                    </value>
+                                    <value name="TEXT">
+                                      <block type="text">
+                                        <field name="TEXT"></field>
+                                      </block>
+                                    </value>
+                                  </block>
+                                </value>
+                                <value name="EXPECTED">
+                                  <block type="text">
+                                    <field name="TEXT"></field>
+                                  </block>
+                                </value>
+                              </block>
+                            </next>
+                          </block>
+                        </next>
+                      </block>
+                    </next>
+                  </block>
+                </next>
+              </block>
+            </next>
+          </block>
+        </next>
+      </block>
+    </statement>
+  </block>
 </xml>
\ No newline at end of file
diff --git a/tests/playground.html b/tests/playground.html
index c728879e7..c05c25b81 100644
--- a/tests/playground.html
+++ b/tests/playground.html
@@ -591,6 +591,30 @@ h1 {
           </shadow>
         </value>
       </block>
+      <block type="text_count">
+        <value name="SUB">
+          <shadow type="text"></shadow>
+        </value>
+        <value name="TEXT">
+          <shadow type="text"></shadow>
+        </value>
+      </block>
+      <block type="text_replace">
+        <value name="FROM">
+          <shadow type="text"></shadow>
+        </value>
+        <value name="TO">
+          <shadow type="text"></shadow>
+        </value>
+        <value name="TEXT">
+          <shadow type="text"></shadow>
+        </value>
+      </block>
+      <block type="text_reverse">
+        <value name="TEXT">
+          <shadow type="text"></shadow>
+        </value>
+      </block>
       <label text="Input/Output:" web-class="ioLabel"></label>
       <block type="text_print">
         <value name="TEXT">