code: function(regexp, desc){
          this.assert(
              regexp.exec(this.obj)
              , function(){ return 'expected ' + this.inspect + ' to match ' + regexp + (desc ? " | " + desc : "") }
              , function(){ return 'expected ' + this.inspect + ' not to match ' + regexp + (desc ? " | " + desc : "") });
          return this;
      }
docs: Assert string value matches _regexp_.
  
  @param {RegExp} regexp
  @param {String} description
  @api public