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Subject: Re: font-lock and fontifying the few first nonempty lines in a buffer
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"Stefan Monnier" <monnier+gnu.emacs.help/news/@flint.cs.yale.edu> wrote in message news:<5lisqr5ume.fsf@rum.cs.yale.edu>...
> >     "\\`\\(\\(.+\n\\)\\{1,7\\}\\)\n"
> 
> You can also try "\\`\\(\\(.+\n\\)*?\\)\n".
> 

"\\(\\`\\(?:\\(?:.+\n\\)*?\\)\n\\)"
with match data set to the whole match.

You can interactively experiment with this stuff using

M-x re-builder <RET>