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run code in 150+ php & hhvm versions
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<?php $value = '2010-05-29 15:54:00'; $pattern = '(\d{4})-(\d{2})-(\d{2}) (\d{2}):(\d{2}):(\d{2})'; var_dump(preg_match($pattern, $value));
Output for 4.3.11 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Unknown modifier '-' in /in/PRpsj on line 7 bool(false)
Output for hhvm-3.10.0 - 3.12.0
Warning: Unknown modifier '-': [(\d{4})-(\d{2})-(\d{2}) (\d{2}):(\d{2}):(\d{2})] in /in/PRpsj on line 7 bool(false)
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '-' in /in/PRpsj on line 7 bool(false)