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define(['./_asciiWords', './_hasUnicodeWord', './toString', './_unicodeWords'], function(asciiWords, hasUnicodeWord, toString, unicodeWords) {
  /** Used as a safe reference for `undefined` in pre-ES5 environments. */  var undefined;
  /**   * Splits `string` into an array of its words.   *   * @static   * @memberOf _   * @since 3.0.0   * @category String   * @param {string} [string=''] The string to inspect.   * @param {RegExp|string} [pattern] The pattern to match words.   * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.   * @returns {Array} Returns the words of `string`.   * @example   *   * _.words('fred, barney, & pebbles');   * // => ['fred', 'barney', 'pebbles']   *   * _.words('fred, barney, & pebbles', /[^, ]+/g);   * // => ['fred', 'barney', '&', 'pebbles']   */  function words(string, pattern, guard) {    string = toString(string);    pattern = guard ? undefined : pattern;
    if (pattern === undefined) {      return hasUnicodeWord(string) ? unicodeWords(string) : asciiWords(string);    }    return string.match(pattern) || [];  }
  return words;});