3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $val = 'dolphin-'; preg_match( $val, '[#1234] Subject', $matches); echo $matches[1]; // 1234
Output for 5.2.0 - 7.1.0
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/pkDFe on line 3
Output for 4.3.11 - 5.0.5, 5.1.1 - 5.1.6
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/pkDFe on line 3 Notice: Undefined offset: 1 in /in/pkDFe on line 4
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/pkDFe on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.10
Warning: Delimiter must not be alphanumeric or backslash in /in/pkDFe on line 3 Notice: Undefined offset: 1 in /in/pkDFe on line 4