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run code in 200+ php & hhvm versions
Bugs & Features
<?php $t = microtime(true); var_dump(!preg_match('/^[^\:]++(\:[^\:]++)*$/', '12345678901234567890:12345678901234567890')); return (microtime(true) - $t);
Output for 4.3.0 - 7.1.7
bool(false)