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run code in 200+ php & hhvm versions
Bugs & Features
<?php preg_match('/^[\w][\w-.]+@[\w-.]+\.[a-z]{2,4}$/U', abcde, $found); print_r($found);
based on C8BX2
Output for 7.2.0
Warning: Use of undefined constant abcde - assumed 'abcde' (this will throw an Error in a future version of PHP) in /in/Ei8S6 on line 2 Array ( )
Output for 5.3.18 - 7.1.10
Notice: Use of undefined constant abcde - assumed 'abcde' in /in/Ei8S6 on line 2 Array ( )