RegEx length limit?

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RegEx length limit?

Postby complicity » Sat Aug 10, 2002 3:51 am

Is there a limit to the length of a regular expression, or some other limitation that I am not aware of? Because sometimes I cannot enter an expression in... for example...

This will take:
(.*\.((JPG)|(MPG)|(MPEG)|(JPEG)|(AVI)|(WMV)))|\([0]+/[0-9]\)

This will not:
(.*\.((JPG)|(MPG)|(MPEG)|(JPEG)|(AVI)|(WMV)))|\([0]+/[0-9][0-9]?[0-9]?\)

Or am I just doing something wrong?

I have other ones that didn't work, but I can't remember the exact syntax.

Even if I edit the filter.xml file, it doesn't appear in NewsBin, although it still shows in the file if I close NB and re-open the xml.

NewsBin 4.01 build 3836, btw
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RE: RegEx length limit?

Postby dexter » Sat Aug 10, 2002 8:57 am

Quade can look up the length limit but in this case, I think our RegEx parser doesn't handle the ? expression. I'll play with it and see.
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RE: RegEx length limit?

Postby complicity » Sat Aug 10, 2002 12:27 pm

I thought that may have been the problem as well, but it says it handles it on this page www.newsbin.com/regexp.htm and also, I have other expressions which use it and they work. They are also longer, which is strange.

Here is one using ? that works, or at least that NB accepts (and it's also longer)...

(.*\.((RAR)|(PAR)|(NFO)|(SFV)|(ZIP)|([P-Z][0-9][0-9])|([0-9][0-9][0-9])))|\([0]+/[0-9][0-9]?[0-9]?\)
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RE: RegEx length limit?

Postby Quade » Sat Aug 10, 2002 2:31 pm

While this doesn't answer the question, since it's going into the filters.xml, why not add it as multiple lines worth of regex?
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RE: RegEx length limit?

Postby complicity » Sat Aug 10, 2002 6:40 pm

Well, that's what I HAVE done, I'm just wondering why certain combinations of regex don't seem to take, since it now seems not to necessarily be tied to the length of the expression... curious...

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