text: 
  var PhoneNumberNormalizer = (function() {
    "use strict";
  
    var UNICODE_DIGITS = /[\uFF10-\uFF19\u0660-\u0669\u06F0-\u06F9]/g,
      VALID_ALPHA_PATTERN = /[a-zA-Z]/g,
      LEADING_PLUS_CHARS_PATTERN = /^[+\uFF0B]+/g,
      NON_DIALABLE_CHARS = /[^,#+\*\d]/g;
  
    // Map letters to numbers according to the ITU E.161 standard
    var E161 = {
      'a': 2, 'b': 2, 'c': 2,
      'd': 3, 'e': 3, 'f': 3,
      'g': 4, 'h': 4, 'i': 4,
      'j': 5, 'k': 5, 'l': 5,
      'm': 6, 'n': 6, 'o': 6,
      'p': 7, 'q': 7, 'r': 7, 's': 7,
      't': 8, 'u': 8, 'v': 8,
      'w': 9, 'x': 9, 'y': 9, 'z': 9
    };
  
    // Normalize a number by converting unicode numbers and symbols to their
    // ASCII equivalents and removing all non-dialable characters.
    function NormalizeNumber(number, numbersOnly) {
      if (typeof number !== 'string') {
        return '';
      }
  
      number = number.replace(UNICODE_DIGITS,
                              function (ch) {
                                return String.fromCharCode(48 + (ch.charCodeAt(0) & 0xf));
                              });
      if (!numbersOnly) {
        number = number.replace(VALID_ALPHA_PATTERN,
                                function (ch) {
                                  return String(E161[ch.toLowerCase()] || 0);
                                });
      }
      number = number.replace(LEADING_PLUS_CHARS_PATTERN, "+");
      number = number.replace(NON_DIALABLE_CHARS, "");
      return number;
    }
  
  
    return {
      Normalize: NormalizeNumber
    };
  })();
  