Textarea not validating

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You can live in their reality or take the red pill. Yes, I think there were an Old One or two protecting them, but they were watching football on the TV, so it wasn't difficult. It's a tokenizer, not a full-blown parser, so it will only split the XML into its component tokens. You can do all that in like 3 lines and be sure it'll work. Let say this: both the Xml Parser and this Regex try to be able to parse all the "legal" XML. This is not about HTML parsing tools in general, nor about HTML parsing shell tools, it’s about parsing HTML via regexes. Note that, however, regex implementations are not really regular expressions in the mathematical sense -- they have constructs that make them stronger, often Turing-complete (equivalent to Type 0 grammars).Like Lord Marshal (is he a relative of the Marshal . Furthermore, do you also realize that pure regex is provably unable to do certain things? It could be done (and it wasn't illegal/immoral), so I have done it. The argument breaks with this fact, but is still somewhat valid in the sense that regexes were never meant to be capable of doing such a job, though. However, like others have pointed out, sometimes using a regex is quicker, easier, and gets the job done if you know the data format.You actually can parse context-free grammars with regex if you break the task into smaller pieces. Pierre de Fermat also figured out how to do it, but the margin he was writing in wasn't big enough for the code.You can generate the correct pattern with a script that does each of these in order: . Divison by zero is a much easier problem than the others you mention. As I have answered in HTML-and-regex questions here so many times before, the use of regex will not allow you to consume HTML.

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The simple operations are pretty much equivalent to increment, decrement and compare to zero respectively. NET regular expression engine to recognize a subset of the context-free languages, in particular the ones that only require a simple counter. NET regular expressions to recognize individual properly balanced constructs.

I doubt anyone reading this page will get the impression that it is socially acceptable to use regexes on HTML.

Caveat: I should note that this regex still breaks down in the presence of CDATA blocks, comments, and script and style elements.

I'll update with the code once I investigate this strange door that just opened in the wall. If you use intervals, rather than plain floating point arithmetic (which everyone should be but nobody is), you can happily divide something by [an interval containing] zero.

The result is simply an interval containing plus and minus infinity. To downvoters: This is working code from an actual product.

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