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run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(preg_replace("/^[^a-zA-Z]+|[!#$%&'* +/=?^`{|}~]+/", "", '_(32jkashdfkj$#!!&&')); var_dump( preg_replace( '|[^a-z0-9_.\-@]|i', '', '_(32jkashdfkj$#!!&&' ));
Output for 4.3.11 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_replace(): Unknown modifier '=' in /in/dK24s on line 2 NULL string(12) "_32jkashdfkj"
Output for hhvm-3.12.0
Warning: Unknown modifier '=': [/^[^a-zA-Z]+|[!#$%&'* +/=?^`{|}~]+/] in /in/dK24s on line 2 NULL string(12) "_32jkashdfkj"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '=' in /in/dK24s on line 2 NULL string(12) "_32jkashdfkj"