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<?php var_dump(preg_match('~(?\'verb\'[0-9]+)~U', 'asdasd123123', $matches), $matches);
based on QPRA3
Output for 4.4.6 - 4.4.9, 5.2.2 - 7.2.0
int(1) array(3) { [0]=> string(1) "1" ["verb"]=> string(1) "1" [1]=> string(1) "1" }
Output for 5.2.0 - 5.2.1
Warning: preg_match(): Compilation failed: unrecognized character after (? at offset 2 in /in/ktWDd on line 3 bool(false) NULL
Output for 4.3.11 - 4.4.5, 5.0.0 - 5.1.6
Warning: preg_match(): Compilation failed: unrecognized character after (? at offset 2 in /in/ktWDd on line 3 bool(false) array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: unrecognized character after (? at offset 2 in /in/ktWDd on line 3 bool(false) array(0) { }