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<?php $string = '--'; $doesNotMatchInPhp7 = '/(?|(---)|(-))\1/'; $matchesInPhp7 = '/(?|(-)|(---))\1/'; var_dump(preg_match($doesNotMatchInPhp7, $string)); var_dump(preg_match($matchesInPhp7, $string));
Output for git.master, git.master_jit, rfc.property-hooks
int(1) int(1)

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