return when {
        pattern.startsWith("**.") -> {
          // With ** empty prefixes match so exclude the dot from regionMatches().
          val suffixLength = pattern.length - 3
          val prefixLength = hostname.length - suffixLength
          hostname.regionMatches(hostname.length - suffixLength, pattern, 3, suffixLength) &&
            (prefixLength == 0 || hostname[prefixLength - 1] == '.')
        }