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run code in 200+ php & hhvm versions
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<?php var_dump(preg_match('~(?\'verb\'[0-9]+)~U', 'asdasd123123'));
based on 0SruO
Output for 4.4.6 - 4.4.9, 5.2.2 - 7.2.0
int(1)
Output for 4.3.11 - 4.4.5, 5.0.0 - 5.2.1
Warning: preg_match(): Compilation failed: unrecognized character after (? at offset 2 in /in/QPRA3 on line 3 bool(false)
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: unrecognized character after (? at offset 2 in /in/QPRA3 on line 3 bool(false)