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<?php $p = '~(?J)(z?)((?1)(?P<group>b)|(?P<group>a))ba~'; // works //$p = '~(?J)(z?)((?1)(?P<group>b)|(?P<group>a))b(?P=group)~'; // fails $s = 'aba'; if (preg_match($p, $s, $m)) { var_dump($m); }
Output for git.master, git.master_jit, rfc.property-hooks
array(6) { [0]=> string(3) "aba" [1]=> string(0) "" [2]=> string(1) "a" ["group"]=> string(1) "a" [3]=> string(0) "" [4]=> string(1) "a" }

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