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<?php var_dump(preg_match('^[01]?[0-9]|2[0-3]):[0-5][0-9](:[0-5][0-9])?$','10:59'));
Output for 4.3.11 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): No ending delimiter '^' found in /in/u1ZjK on line 2 bool(false)
Output for hhvm-3.12.0
Warning: No ending delimiter '^' found: [^[01]?[0-9]|2[0-3]):[0-5][0-9](:[0-5][0-9])?$] in /in/u1ZjK on line 6 bool(false)
Output for hhvm-3.10.0
Warning: No ending delimiter '^' found: [^[01]?[0-9]|2[0-3]):[0-5][0-9](:[0-5][0-9])?$] 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)