3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $matches = null; preg_match('/^(d{1,2}([a-z]+)) (?:s*) (?200[0-9])/', '21st March 2006', $matches); var_dump($matches);
Output for 5.2.4 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Compilation failed: (?R or (?[+-]digits must be followed by ) at offset 30 in /in/2c4pm on line 3 NULL
Output for hhvm-3.10.0 - 3.12.0
Warning: Compilation failed: (?R or (?[+-]digits must be followed by ) at offset 30 in /in/2c4pm on line 3 NULL
Output for 5.2.0 - 5.2.3
Warning: preg_match(): Compilation failed: (?R or (?digits must be followed by ) at offset 30 in /in/2c4pm on line 3 NULL
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 30 in /in/2c4pm on line 3 array(0) { }
Output for 4.4.9
Warning: preg_match(): Compilation failed: (?R or (?[+-]digits must be followed by ) at offset 30 in /in/2c4pm on line 3 array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: (?R or (?digits must be followed by ) at offset 30 in /in/2c4pm on line 3 array(0) { }