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run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(preg_match('\d{4}$', 2013));
Output for 4.3.11 - 7.1.0
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/YTWOZ on line 2 bool(false)
Output for 4.3.0 - 4.3.10
Warning: Delimiter must not be alphanumeric or backslash in /in/YTWOZ on line 2 bool(false)