咱的节日-2018京台社区文化大舞台暨元宵节视频连线

Question

The goal is to highlight text inside [...] with a different color than text inside ![...]!

Also everything should be nestable such that [...] could contain ![...]! inside of it or vice versa and the colors should be different as desired.

I tried the following regex to try and match them differently but unfortunately wasn't able to succeed with it.

syn region  squareBracketRegex_A start="^\[\|[^!]\[" skip="\[[^\]]*\]" end="\]" keepend oneline contains=squareBracketRegex_B
syn region  squareBracketRegex_B start="!\[" skip="!\[[^\]]!*\]!" end="\]!" keepend oneline contains=squareBracketRegex_A
hi def link squareBracketRegex_A ColorGreen
hi def link squareBracketRegex_B ColorRed

Remark: I would like that the brackets themselves should take highlighting of whatever item they're contained in.

Answer 1

Despite the fact that the highlighting groups ColorGreen and ColorRed are not defined I can't reproduce your problem.

The following syntax seems to work fine for me:

syn region squareBracketRegex_A start="\(!\@<!\[\)\@<=" skip="\[[^\]]*\]" end="\ze\]" keepend oneline contains=squareBracketRegex_B
syn region squareBracketRegex_B start="\(!\[\)\@<=" skip="!\[[^\]!]*\]!" end="\ze\]!" keepend oneline contains=squareBracketRegex_A
hi ColorGreen guifg=#008000
hi ColorRed guifg=#FF0000
hi def link squareBracketRegex_A ColorGreen
hi def link squareBracketRegex_B ColorRed

Remark: I have replaced ^\[\|[^!]\[ by !\@<!\[ but your version works also fine on my end.

Comments:

• !\@<! match only if the preceding token is not ! (more information with :help /\@<!)
• Hence !\@<!\[ match [ unless there is a ! in front of it
• \(...\)\@<= match with zero width if ... match right before. This to avoid that the opening token: ![ is included in the region (more information with :help /\@<=)
• \ze]! match with zero width right before ]!. This to avoid that the closing ]! is inclucded in the region (more information with :help /\ze)