{"ast_node_type":"other","tokens":[{"end":34,"kind":"keyword","start":0,"text":"//"}]}
        // (?P<flags> [-+ 0\#']* )
        // (?: (?P<parameter> \d+) \$ )?
        // (?P<width> \d+ | \* (?: (?P<widtha> \d+) \$ )? )?