preg_match_all this- _obj_call_regexp this- _mod_regexp valid object c

preg_match_all('~(?>
                ' . $this->_obj_call_regexp . '(?:' . $this->_mod_regexp . '*)? | # valid object call
                ' . $this->_var_regexp . '(?:' . $this->_mod_regexp . '*)?    | # var or quoted string
                \-?0[xX][0-9a-fA-F]+|\-?\d+(?:\.\d+)?|\.\d+|!==|===|==|!=|<>|<<|>>|<=|>=|\&\&|\|\||\(|\)|,|\!|\^|=|\&|\~|<|>|\||\%|\+|\-|\/|\*|\@    | # valid non-word token
                \b\w+\b                                                        | # valid word token
                \S+                                                           # anything else
                )~x', $tag_args, $match);