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run code in 200+ php & hhvm versions
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<?php preg_match('/^[A-Z]+$/i', "abcAbc^Xyz", $m); echo "4. "; var_dump($m);
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
4. array(0) { }