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lang-perl
\zsbut it looks like that was just what it needed\zs. It looks like it breaks some other match expressions, for example if you havesyn match checkNumber "\<[0-9]\+\>"and then the\zsexpression following after:syn match checkNumber "\<[0-9]\+\>",:hi link checkNumber Keyword,:syn match noneIndentError /^\( \{4\}\)*\zs \{,3\}/,:hi link noneIndentError Error)\zsandzeinsyn matchexpressions might pose a problem if you expect the part that's not part of the match to actually match some othersyn matchrule... In those cases, you'll need to do an actual zero-width look-behind or look-ahead. But it's hard to tell you what's wrong with your setup without more details, so perhaps ask a separate question for that if you like. BTW, you might like the Vi and Vim Stack Exchange for questions on Vim (oh, I guess already told you about it in another question...)\zsis not finding a match so the expression doesn't have a\ze. I onlt really know Perl RegEx so this has me baffled. I def want to try the Vim exchange