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Re: Being Forced to Fork with Nested Regular Expressions

by adrianh (Chancellor)
on Jan 02, 2004 at 17:31 UTC ( #318361=note: print w/ replies, xml ) Need Help??


in reply to Being Forced to Fork with Nested Regular Expressions

Any suggestions to get around this, or am I stuck?

With regexes I think you'll remain stuck. You'll also restrict yourself to assertions about simple strings which I imagine you'll quickly find restrictive.

Personally I think using the call stack to implement your backtracking will be a lot easier - but I would say that wouldn't I :-)


Comment on Re: Being Forced to Fork with Nested Regular Expressions
Re: Re: Being Forced to Fork with Nested Regular Expressions
by Ovid (Cardinal) on Jan 02, 2004 at 18:07 UTC

    I once tried to write a generic wrapper using your code, but I failed. I probably just didn't take enough time to play with it, but that was about the point where I stopped working on this last time.

    Cheers,
    Ovid

    New address of my CGI Course.

      Somewhat belated reply ;-)

      Even if you don't use the call stack, I think that the regex engine is probably the wrong choice - it's just not made to be used that way easily (as you've found out :-)

      Implementing backtracking isn't really that hard. All you really need is a stack. I'd start there if it was me.

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