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run code in 150+ php & hhvm versions
Bugs & Features
<?php $matches=array(); $string = 'This is a [templateVar]'; preg_match_all("/^[a-z]*@[a-z]*[.[a-z]{2}?.[a-z]{2}]?[.[a-z]{3}]?/", "usde@dev.co.in", $matches); var_dump($matches);
based on KfnsN
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> array(1) { [0]=> string(14) "usde@dev.co.in" } }
Output for hhvm-3.10.0

Process exited with code 153.