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<?php $string1 = "sqrtpdrt"; // matched $string2 = "qwntfschrprtkjs"; // not matched (contains chr group) $regex = '/^(?= .*[bcdfghjklmnpqrstvwxz]{4} )(?!.*chr)/ix'; var_dump(preg_match($regex, $string1)); var_dump(preg_match($regex, $string2));
Output for git.master, git.master_jit, rfc.property-hooks
int(1) int(0)

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