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lookbehind [2020/09/25 11:54] – revuskylookbehind [2020/09/25 12:02] – [Summary] revusky
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 ==== Summary ==== ==== Summary ====
  
-A //lookbehind predicate// starts optionally with a tilde "~" to indicate negation. The first character after the tilde (or simply the first character if there is no tilde) must be either a backslash or a forward slash. The backslash indicates that we are scanning backwards from the current production and the forward slash is that we are scanning forward from the current production.+A //lookbehind predicate// starts optionally with a tilde "~" to indicate negation. The first character after the tilde (or simply the first character if there is no tilde) must be either a backslash or a forward slash. The backslash indicates that we are scanning backwards from the current production and the forward slash means that we are scanning forward from the current production.
  
 An ellipsis "..." means that we can have an arbitrary number (including zero) of intervening productions. A dot "." means that we have exactly one production of any type.  An ellipsis "..." means that we can have an arbitrary number (including zero) of intervening productions. A dot "." means that we have exactly one production of any type.