3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php preg_match( '/[#(\d+)\]/', '[#1234] Subject', $matches); echo $matches[1]; // 1234
Output for 5.2.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Compilation failed: missing terminating ] for character class at offset 9 in /in/HVCAd on line 2
Output for hhvm-3.12.0
Warning: Compilation failed: missing terminating ] for character class at offset 9 in /in/HVCAd on line 2
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.11 - 5.0.5, 5.1.1 - 5.1.6
Warning: preg_match(): Compilation failed: missing terminating ] for character class at offset 9 in /in/HVCAd on line 2 Notice: Undefined offset: 1 in /in/HVCAd on line 3
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/HVCAd on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: missing terminating ] for character class at offset 9 in /in/HVCAd on line 2 Notice: Undefined offset: 1 in /in/HVCAd on line 3