3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php preg_match('#(?<123>.+)#', 'foo');
Output for 5.4.41 - 5.4.45, 5.5.10 - 7.1.0
Warning: preg_match(): Compilation failed: group name must start with a non-digit at offset 3 in /in/7KJrs on line 3
Output for 5.2.2 - 5.4.40, 5.5.0 - 5.5.9
Warning: preg_match(): Numeric named subpatterns are not allowed in /in/7KJrs on line 3
Output for 4.3.11 - 4.4.5, 5.0.0 - 5.2.1
Warning: preg_match(): Compilation failed: unrecognized character after (?< at offset 3 in /in/7KJrs on line 3
Output for 4.4.6 - 4.4.9
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: unrecognized character after (?< at offset 3 in /in/7KJrs on line 3