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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 4.3.11 - 7.2.0
Warning: preg_match(): No ending delimiter '^' found in /in/u1ZjK on line 2 bool(false)
Output for 4.3.0 - 4.3.10
Warning: No ending delimiter '^' found in /in/u1ZjK on line 2 bool(false)