Here is an easy way to do this:
in vim, make sure syntax highlighting is enabled with :syn on
run the command :highlightto get a list of all the highlight group names and samples of how they look. The group Errorlooks as if it stands out well in my color scheme, so I will use it in my example (but you can use any other name, for example Todoor Search)
:syntax match Error /\[Capítulo[^\]]*\]/
This template will save you from greedy matching the largest fragment. Despite the fact that other people suggest you use a regex /\[Capítulo.*\]/, this is probably not what you want, because it will match all in between if there are two or more such patterns in the string.
For example, it /\[Capítulo.*\]/will match this entire line:
[Capítulo foo] these words should not stand out [Capítulo bar]
, /\[Capítulo[^\]]*\]/ []:
[Capítulo foo] [Capítulo bar]
, , , , , , .*, . [^\]]*, , " , ].
, , ":" .vimrc