2016-01-17 12:32 GMT+03:00 Axel Bender <[email protected]>:
> Given the following two files, it seems that a "\(...\)" matching group
> prevents the pattern from matching:
>
> [man.txt] (please note that this is supposed to be
> a man page, so the special chars are really 0x8s!
> ---------------------------------------
> ( (M M- -T TA AB B) )
> ---------------------------------------
>
> [man.vim]
> ---------------------------------------
> syntax clear
>
> " Try these in order:
>
> """"" Ok """""
> "yntax match manKey "(\b(\([CM]\)\b\1-\b-[^)]*)\b)"
>
> """"" As I don't need the parens, I added a matching group "\(...\)" at
> the beginning ("\@<=" is not yet present!) """""
> "yntax match manKey "\((\b(\)\([CM]\)\b\1-\b-[^)]*)\b)"
>
> """"" This works """""
> "yntax match manKey "(\b(\([CM]\)\b\1-\b-[^)]*)\b)"hs=s+3,he=e-3
>
> highlight manKey guibg=black guifg=white
> ---------------------------------------
>
This should go to vim-use, not vim-dev. Regular expression is working
completely correct, just ask yourself (or documentation) what does `\1` in
regex mean.
You should not use \(\) unless you do mean to use matched part somewhere.
If you do not use \%(\) ((?:) in Perl-like regexes).
>
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