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    $COMMENT_rex = qr{
  <!--            # opening <!--
...
  )*              # 0 or more times
  -- \s* >        # the ending -->
}x;
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    $COMMENT_rex =
  qr{<!--[^-]*(?:(?!--\s*>)-(?:-[^-]*(?:-[^-]+)*)?[^-]*)*--\s*>};