Surrounds the string with the specified string(s).

String.prototype.wrap.js

(function(RGX, STR, undefined) {
  /**
   * Surrounds the string with the specified string(s).
   * @param  {string} wrap1
   *     The string to precede this string.
   * @param  {string=} opt_wrap2
   *     The string to follow this string.  Defaults to the value of `wrap1` if
   *     not given.
   * @param  {string=} opt_wrap1rep
   *     The string to replace all occurrences of `wrap1` within this string.
   *     Defaults to the value of `wrap1` if not given.
   * @param  {string=} opt_wrap2rep
   *     The string to replace all occurrences of `opt_wrap2` within this
   *     string.  Defaults to the value of `opt_wrap1rep` if not given.
   * @return {string}
   *     Returns this string surrounded by the wrap string(s).
   */
  String.prototype.wrap = function(wrap1, opt_wrap2, opt_wrap1rep, opt_wrap2rep) {
    var me = this, min, min1, min2;
    opt_wrap2 = opt_wrap2 == undefined ? wrap1 : opt_wrap2;
    if (arguments.length > 2) {
      opt_wrap1rep = opt_wrap1rep == undefined ? wrap1 : opt_wrap1rep;
      opt_wrap2rep = opt_wrap2rep == undefined ? opt_wrap1rep : opt_wrap2rep;
      me = me.replace(
        new RegExp('(' + wrap1.replace(RGX, STR) + ')|' + opt_wrap2.replace(RGX, STR), 'g'),
        function (match, isLeft) {
          return isLeft ? opt_wrap1rep : opt_wrap2rep;
        }
      );
    }
    return wrap1 + me + opt_wrap2;
  };
})(/\W+/g, '\\$&');