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run code in 200+ php & hhvm versions
Bugs & Features
<?php $str = 'dfpepito.'; $allowed = array(".", "-", "_"); var_dump(preg_match('/^[-._]|[-._]$/i', $str));
based on HodqT
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
int(1)