Drew Csillag wrote:
> Diff attached.

That regexp collection is already pretty hairy because of the preceding line, 
which is a near-duplicate.  How about refactoring it as per attached untested 
patch instead?  The idea is to surround the entire keyword with \(...\), so that 
the matching regexp is of the form \(\(m4_\)?\(keyword1\|keyword2\|...\)\).