If there are multiple headers named "Header", the matched string contains each of them are individually matched, the headers, newline separated, starting from first (topmost).
- If Header:raw is used, all whitespace and newlines are preserved. Again multiple headers are concatted in the same matching string.
- When using anchors (/^foo/), use m-modifier if any of the duplicate Headers should match. Without, only the first header (line) will match.