3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $pattern = '/\bRo\(M\)\b?/ui'; $sample = 'Ro(M)'; echo (int)preg_match( $pattern, $sample, $matches).PHP_EOL; print_r($matches);
based on P9BVD
Output for 5.2.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Compilation failed: nothing to repeat at offset 11 in /in/Si0jE on line 4 0
Output for hhvm-3.10.0 - 3.12.0
Warning: Compilation failed: nothing to repeat at offset 11 in /in/Si0jE on line 4 0
Output for 4.3.11 - 4.4.9, 5.0.2 - 5.1.6
Warning: preg_match(): Compilation failed: nothing to repeat at offset 11 in /in/Si0jE on line 4 0 Array ( )
Output for 5.0.0 - 5.0.1
Warning: preg_match(): Compilation failed: nothing to repeat at offset 11 in /in/Si0jE on line 4 Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/Si0jE on line 4 0PHP_EOLArray ( )
Output for 4.3.10
Warning: Compilation failed: nothing to repeat at offset 11 in /in/Si0jE on line 4 0 Array ( )
Output for 4.3.0 - 4.3.9
Warning: Compilation failed: nothing to repeat at offset 11 in /in/Si0jE on line 4 Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/Si0jE on line 4 0PHP_EOLArray ( )