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run code in 200+ php & hhvm versions
Bugs & Features
<?php $tests = array( 'abcdef', 'abc.fff.com', 'bla@mail.com', 'suikoden108', ); foreach ( $tests as $name) var_dump(strtolower(preg_replace('/[^A-Za-z0-9?!]/','', $name)));
Output for 4.3.0 - 7.2.0
string(6) "abcdef" string(9) "abcfffcom" string(10) "blamailcom" string(11) "suikoden108"