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run code in 150+ php & hhvm versions
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<?php var_dump(preg_match("/(?P<foo>\\d{2,})/si", 'foo bar 439689 lol', $m), $m);
based on jUqBn
Output for 4.3.3 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
int(1) array(3) { [0]=> string(6) "439689" ["foo"]=> string(6) "439689" [1]=> string(6) "439689" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 4.3.2
int(1) array(2) { [0]=> string(6) "439689" [1]=> string(6) "439689" }