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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(): Unknown modifier ':' in /in/rGSD1 on line 2 bool(false)

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