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What's the syntax for optional tokens in an 'errorformat'?

Details

Using Visual Studio, I have a compiler/msvc.vim setup like this:

CompilerSet errorformat&
CompilerSet errorformat^=%f(%l):\ %trror\ C%n:\ %m

It successfully captures errors like this (including capturing the error number):

c:\proj\stuff.cpp(71): error C2660: 'Stuff::Tick': function does not take 1 arguments

However, when I build a project with parallel project compilation enabled, I get output prefixed with a number and > (to identify each project's output):

1>c:\proj\stuff.cpp(71): error C2660: 'Stuff::Tick': function does not take 1 arguments
2>c:\proj\heavy\grill.cpp(71): error C2660: 'Grill::Tick': function does not take 1 arguments

I can change my errorformat to match the 1>:

CompilerSet errorformat^=%*\\d>%f(%l):\ %trror\ C%n:\ %m

How do I modify my errorformat to merge these two lines? How do I do the equivalent of a capture ^\(\d>\)\?

:help efm-ignore mentions:

Important note: The (...) grouping of sub-matches can not be used in format specifications because it is reserved for internal conversions.

Does that mean the only way is to include lines with and without the 1> matching pattern (all above lines) in my compiler script?

How to ignore beginning of line in errorformat doesn't answer my question because it's for discarding preamble that's always there.

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  • I found that the build log file doesn't include the 1> characters. :cgetfile c:\proj\obj\x64\debug\proj\proj.log is a better solution than pasting from Visual Studio's Output Window for my example problem, but I'd still like to know if there's an answer.
    – idbrii
    Sep 30, 2023 at 14:02
  • The syntax for optional items would just be %\\?, I think, but the lack of grouping is a problem. Fortunately, there's really nothing wrong with multiple entries… You could also :help errorformat and /^Filtering messages: set makeprg to filter the numbers out?
    – D. Ben Knoble
    Sep 30, 2023 at 17:55

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