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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}