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run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump( preg_match( '/(?P<!>foo)/', 'foo' ) );
Output for 4.4.6 - 4.4.9, 5.2.2 - 7.1.0
Warning: preg_match(): Compilation failed: syntax error in subpattern name (missing terminator) at offset 4 in /in/QUBGa on line 3 bool(false)
Output for 4.3.11 - 4.4.5, 5.0.0 - 5.2.1
Warning: preg_match(): Compilation failed: syntax error after (?P at offset 4 in /in/QUBGa on line 3 bool(false)
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: syntax error after (?P at offset 4 in /in/QUBGa on line 3 bool(false)