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run code in 150+ php & hhvm versions
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<?php $regex = '#^[0-9a-zA-Z\-\+\#\|\/\\\(\)]*$$'; var_dump( preg_match('@',$regex,$regs) );
Output for 4.3.11 - 7.1.0
Warning: preg_match(): No ending delimiter '@' found in /in/FuJst on line 5 bool(false)
Output for 4.3.0 - 4.3.10
Warning: No ending delimiter '@' found in /in/FuJst on line 5 bool(false)