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

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-- Language definition generated by lang2to3

Description="Regex tests"

Keywords={
  { Id=1,
    List={"goto", "break", "return", "continue", "asm", "case", "default", "if", "else", "switch", "while", "for", "do", "sizeof"},
  },
  { Id=4,
    Regex=[[^\:.*]],
  },
}