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/usr/share/highlight/langDefs/awk.lang is in highlight-common 3.8-2.

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-- Language definition generated by lang2to3

Description="(G)AWK"

Keywords={
  { Id=1,
    List={"begin", "break", "close", "continue", "delete", "do", "else", "end", "exit", "for", "getline", "gsub", "if", "index", "length", "match", "next", "print", "printf", "return", "split", "sprintf", "sub", "substr", "system", "tolower", "toupper", "while"},
  },
  { Id=2,
    List={"argc", "argind", "argv", "convfmt", "environ", "errno", "fieldwidths", "filename", "fnr", "fs", "ignorecase", "nf", "nr", "ofmt", "ofs", "ors", "rlength", "rs", "rstart", "rt", "subset"},
  },
  { Id=3,
    List={"function"},
  },
}

Strings={
  Delimiter=[["|']],
  Escape=[[ [\\%]\d{3}|[\\%]x\d{2}|[\\%][ntvbrfa\\\?'"%] ]]
}

IgnoreCase=true

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

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

--FIXME no default escchar param: regex([\\%]\d{3}|[\\%]x\d{2}|[\\%][ntvbrfa\\\?'"%])