Editing Build a regexp table

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Preparation code

Preparation code HTML (this will be inserted in the <body> of a valid HTML5 document in standards mode) (useful when testing DOM operations or including libraries)

function replacer1(translationTable) {
  /**
   * An array of translationTable keys.
   * @type {Array.<string>}
   */
  var pattern = [];

/**
   * The regular expression doing the replacement job.
   * @type {RegExp}
   */
  var regExp;

/**
   * Used to iterate over translationTable.
   * @type {string}
   */
  var key;

for (key in translationTable) {
    // Escaping regexp special chars.
    key = key.replace(/(\^|\$|\*|\+|\?|\.|$|$|\[|\]|\{|\}|\||\\|\/)/g, '\\\$1');
    pattern.push(key);
  }

regExp = new RegExp(pattern.join('|'), 'g');

/**
   * @param {string} str Input string.
   * @return {string} The string replaced.
   */
  return function(str) {
    return str.replace(regExp, function(str) {
      return translationTable[str];
    });
  };
}

function replacer2(translationTable) {
  /**
   * The regular expression doing the replacement job.
   * @type {RegExp}
   */
  var regExp;

/**
   * An array containing the keys of the replacement table.
   * @type {Array.<string>}
   */
  var keys = Object.keys(translationTable);

keys = keys.map(function(key) {
    return key.replace(/(\^|\$|\*|\+|\?|\.|$|$|\[|\]|\{|\}|\||\\|\/)/g, '\\\$1');
  });

regExp = new RegExp(keys.join('|'), 'g');

function replacer3(translationTable) {
  /**
   * The regular expression doing the replacement job.
   * @type {RegExp}
   */
  var regExp;

/**
   * An array containing the keys of the replacement table.
   * @type {Array.<string>}
   */
  var keys = Object.keys(translationTable);

for (var i = 0, len = keys.length; i < len; i++) {
    keys[i] = keys[i].replace(/(\^|\$|\*|\+|\?|\.|$|$|\[|\]|\{|\}|\||\\|\/)/g, '\\\$1');
  }

regExp = new RegExp(keys.join('|'), 'g');

Include JavaScript libraries as follows: <script src="//cdn.ext/library.js"></script>

Define setup for all tests (variables, functions, arrays or other objects that will be used in the tests) (runs before each clocked test loop, outside of the timed code region) (e.g. define local test variables, reset global variables, clear canvas, etc.) (see FAQ)

Define teardown for all tests (runs after each clocked test loop, outside of the timed code region) (see FAQ)

Code snippets to compare

Test 1

Title

Async (check if this is an asynchronous test)

Code

replacer1(table);

Test 2

Title

Async (check if this is an asynchronous test)

Code

replacer2(table);

Test 3

Title

Async (check if this is an asynchronous test)

Code

replacer3(table);