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/usr/share/highlight/langDefs/vimscript.lang is in highlight-common 3.41-1.

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Description="vimscript"

Digits = [[ (?:[0-9])(?:0x|0X|0b)[0-9a-fA-F']+|#?\d*[\.]?\d+(?:[eE][\-\+]\d+)?[lLuU]* ]]

Keywords={
  {  Id=1,
    List={ "call", "set", "let",  "au", "if", "endif", "else", "has",
    "autocmd", "augroup", "end"},
  },
  { Id=2,
    List= { "filetype", "ft", "syntax", "colorscheme" }
  },
  { Id=3,
    Regex=[[[nvxsoilc]n?o?remap|\&\w+]]
  },
  { Id=4,
    Regex=[[\w*\((.+\))]], Group=1
  }  
}

Strings = {
  Delimiter=[[']],
  
   DelimiterPairs= {
    { Open=[["(?=.*")]], Close=[["]] }
  }
}

Comments = {
   {
     Block=false,
     Nested=false,
     Delimiter = { [[ ^"|"(?!.*")]] }
   }
}

IgnoreCase=true

Operators=[[\(|\)|\[|\]|\{|\}|\,|\;|\.|\:|\&|<|>|\!|=|\/|\*|\%|\+|\-|\~|\||\^]]

function OnStateChange(oldState, newState, token)

   if newState==HL_STRING  then
      openDelim=token
   end

   if oldState==HL_STRING and token==openDelim then
      openDelim = nil
      return HL_STRING_END
   end
   
   return newState
end