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run code in 150+ php & hhvm versions
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<?php $postcode = '64140 Tiukka'; preg_replace('/\s|[a-zA-z]/gi', '', $postcode);
Output for 4.3.11 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_replace(): Unknown modifier 'g' in /in/OF6QM on line 3
Output for hhvm-3.12.0
Warning: Unknown modifier 'g': [/\s|[a-zA-z]/gi] in /in/OF6QM on line 3
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier 'g' in /in/OF6QM on line 3