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<?php $string = 'bar'; $matches = []; preg_match('~(?|foo(*:1) |bar(*:2) |baz(*:3))~x', $string, $matches); var_dump($matches);
Output for rfc.property-hooks, git.master, git.master_jit
array(2) { [0]=> string(3) "bar" ["MARK"]=> string(1) "2" }

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