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<?php var_dump(preg_match('#^[01]?[0-9]|2[0-3]):[0-5][0-9](:[0-5][0-9])?$#','10:59'));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_match(): Compilation failed: unmatched closing parenthesis at offset 18 in /in/qHmd5 on line 2 bool(false)

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