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run code in 150+ php & hhvm versions
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<?php $var = ''; $name = 'svc251'; $r = preg_match('|^svc(\d+)$|', $name, $var); var_dump($r); print("\n\n"); var_dump($var); print("\n\n");
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
int(1) array(2) { [0]=> string(6) "svc251" [1]=> string(3) "251" }
Output for hhvm-3.10.0

Process exited with code 153.