code: public function _or($value) {
          if (strpos($this->prefixes, "(") === false) {
              $this->prefixes .= "(?:";
          }
          if (strpos($this->suffixes, ")") === false) {
              $this->suffixes .= ")";
          }
          $this->add(")|(?:");
          if ($value) {
              $this->add($value);
          }
          return $this;
      }
docs: OR
  
  Wraps the current expression in an `or` with $value
  Notice: OR is a reserved keyword in PHP, so this method is prefixed with "_"
  
  @access public
  @param  string $value new expression
  @return VerbalExpressions