function stripslashes (str) {
  // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +   improved by: Ates Goral (http://magnetiq.com)
  // +      fixed by: Mick@el
  // +   improved by: marrtins
  // +   bugfixed by: Onno Marsman
  // +   improved by: rezna
  // +   input by: Rick Waldron
  // +   reimplemented by: Brett Zamir (http://brett-zamir.me)
  // +   input by: Brant Messenger (http://www.brantmessenger.com/)
  // +   bugfixed by: Brett Zamir (http://brett-zamir.me)
  // *     example 1: stripslashes('Kevin\'s code');
  // *     returns 1: "Kevin's code"
  // *     example 2: stripslashes('Kevin\\\'s code');
  // *     returns 2: "Kevin\'s code"
  return (str + '').replace(/\\(.?)/g, function (s, n1) {
    switch (n1) {
    case '\\':
      return '\\';
    case '0':
      return '\u0000';
    case '':
      return '';
    default:
      return n1;
    }
  });
}

stripslashes('Kevin\'s code');

"Kevin's code"

stripslashes('Kevin\\\'s code');

"Kevin\'s code"