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/usr/share/highlight/langDefs/tex.lang is in highlight-common 3.18-3.

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The actual contents of the file can be viewed below.

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-- FIXME omitted definition of $NESTED(PL)
-- Language definition generated by lang2to3

Description="TeX and LaTeX"

Keywords={
  { Id=1,
    Regex=[[\\\w+]],
  },
  { Id=2,
    List={"a4paper", "report", "ngerman", "dvips", "", "graphicx", "latin1", "inputenc", "", "T1", "fontenc", "color", "alltt", "document", "tabbing", "", "tocdepth"},
  },
  { Id=3,
    Regex=[[\#\d+]],
  },
}

IgnoreCase=false

Comments={
  { Block=false,
    Delimiter= { [[(?<!\\)%.*$]] },
  },
  { Block=true,
    Nested=false,
    Delimiter= { [[\(\*]],[[\*\)]],}
  }
}

NestedSections = {
  { Lang="perl", Delimiter= { [[\\perl(?:re)?newcommand\{\\\w+\}\[.*\]\{]], [[\{]] } },
  { Lang="perl", Delimiter= { [[\\perl(?:re)?newenvironment\{\w+\}\[.*\]\{]], [[\{]] } },
  { Lang="inc_luatex", Delimiter= { [[\\directlua0?.*?\{]], [[(?<!\{)\}]] } },
  { Lang="r", Delimiter= { [[<<.*>>=]], [[@]] } },
}

Operators=[[ \{|\}|\[|\] ]]