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run code in 200+ php & hhvm versions
Bugs & Features
<?php $re = '~\[do action\=\"[^\"]*\"\s?[^\]\/]*\]( [^\[\d\o{123}\n]* )\[\/do\]~'; preg_match($re, 'abc'); var_dump($re);
Output for 4.3.0 - 7.2.0
string(67) "~\[do action\=\"[^\"]*\"\s?[^\]\/]*\]( [^\[\d\o{123}\n]* )\[\/do\]~"