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5.1 Matching syntax

This is the language definitions somewhat slopply descriped:

     
     expr = TRUE,
          FALSE,
          ! expr,
          expr AND expr,
          expr OR expr,
          ( expr )
          compare
     
     compare =
          word == word,
          word != word,
          word IN ( word [, word ...])
          word IN %{variable.subvariable}
     
     word =
          STRING,
          %{variable}