3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php preg_match('/^(\d{1,2}([a-z]+))(?:\s*)\S+ (?200[0-9])/', '21st March 2006', $matches); print_r($matches); ?>
Output for 5.2.4 - 7.1.0
Warning: preg_match(): Compilation failed: (?R or (?[+-]digits must be followed by ) at offset 34 in /in/jDoZ3 on line 2
Output for 5.2.0 - 5.2.3
Warning: preg_match(): Compilation failed: (?R or (?digits must be followed by ) at offset 34 in /in/jDoZ3 on line 2
Output for 4.3.11 - 4.4.8, 5.0.0 - 5.1.6
Warning: preg_match(): Compilation failed: (?R or (?digits must be followed by ) at offset 34 in /in/jDoZ3 on line 2 Array ( )
Output for 4.4.9
Warning: preg_match(): Compilation failed: (?R or (?[+-]digits must be followed by ) at offset 34 in /in/jDoZ3 on line 2 Array ( )
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: (?R or (?digits must be followed by ) at offset 34 in /in/jDoZ3 on line 2 Array ( )