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run code in 150+ php & hhvm versions
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<?php $r = preg_match('~^abc$~', 'abc'); var_dump($r); $r = preg_match('~^abc$~', "def\nabc"); var_dump($r);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(1) int(0)