On Thu, May 20, 2021 at 05:29:50PM +0700, Yuri Khan wrote: > > > How could I negate the regexp that I have defined? > > > > I don't even know what you mean by "negating a regexp". > > The automata theory, where the notion of a regexp comes from, defines > a “regular set” [...]
A beautiful theory, indeed. In that context, "negation" has a definite meaning (but, as you wrote: anchoring, yadda, yadda). I'm almost sure this is *not* what steve-humphreys had in mind (but hey, I've been wrong before [1]!). > So, to steve-humphreys: There is no practical general way to negate a > regexp. You need to either negate the result of attempting to match, > or to think hard and write a new regexp that matches what you want. Exactly. I think that, to get some help here, steve will have to refine his idea a bit for us to have a chance of making some sense of it. Cheers [1] This is, as you might suspect, a shameless understatement :) -- t
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