Re: regular expressions
David Tolpin: > Bob Foster: > > > Why isn't it done? > > > > Good question. It should be. Of course, the notation suggests to most > > compsci people that recursion will be permitted, i.e., that this is a > > context-free instead of regular grammar, and that's probably not what > > you intended. > > The technique to detect recursions and stop context-grammars early is > just concatenate. If there is a recursion, the Scheme interpreter > will run out of space and the validator will immediately report an error > in the expression. Bob, thank you; after thinking about it again, I've added the explicit check for recursion, it is cleaner this way. And just two lines of code. David
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