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<?php $string1 = "aaabchr"; $string2 = "qwntfschrprtkjs"; $regex = '/^(?:.(?!chr))*(?:[bcdfghjklmnpqrstvwxz](?!chr)){4}(?:.(?!chr))*$/i'; var_dump( preg_match($regex, $string1), preg_match($regex, $string2) );
Output for git.master, git.master_jit, rfc.property-hooks
int(0) int(0)

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