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<?php var_dump(preg_match("/^[A-Za-z_]+$/", '_es', $matches)); var_dump($matches);
Output for 4.3.0 - 5.6.25, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(1) array(1) { [0]=> string(3) "_es" }