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

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The actual contents of the file can be viewed below.

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Description="Generic config files"

Keywords={
  { Id=1,
    Regex=[[^\s*[\w@]+]]
  },
 { Id=2,
    Regex=[[\d[\d.]*]]
  },
  { Id=3,
    Regex=[[/\S+|/]]
  }
 
}

Strings={
  Delimiter=[["|']],
}

Comments={
  { Block=false,
    Delimiter={ [[#]] },
  },
  { Block=false,
    Delimiter={ [[^;]] },
  },
}

Operators=[[\,|\;|\.|\:|\~]]

Digits=[[\d*\.?\d+ ]]