[cl-ppcre-devel] strange scan results

[Noldus Reijnders]

Hi Edi and Hans,
 
Thanks for answering my questions. I actually already noticed the mistake with the backslashes myself, however I received a delivery failure when trying to send a mail to the mailing list about this. 
Thanks again for the quick help!
 
Noldus
> From: edi at weitz.de
> Date: Wed, 30 Nov 2011 13:08:35 +0100
> To: cl-ppcre-devel at common-lisp.net
> Subject: Re: [cl-ppcre-devel] strange scan results
> 
> Hi Noldus,
> 
> What Hans says.  The regex engine usually stops at the first match, so
> you have to be careful, because you'll get what you asked for.
> General questions about regular expressions are best answered by one
> of the numerous online articles or for example by the good O'Reilly
> book.  I might also shamelessly recommend my "Regex Coach"
> application.
> 
> As for the other question: You should enter the regex string into your
> Lisp listener and see what you'll get back.  This has something to do
> with how CL treats backslashes in strings - there's also a section
> about this in the CL-PPCRE documentation.
> 
> Cheers,
> Edi.
> 
> 
> On Tue, Nov 29, 2011 at 4:51 PM, Noldus Reijnders
> <n_reijnders at hotmail.com> wrote:
> > Hey again!
> >
> > I came across something of which I don't understand why it happens.. When I
> > do this:
> >
> > (scan "[a-z]*" "<test>")
> >
> >
> >
> > I get:
> > 0
> > 0
> > #()
> > #()
> >
> >
> > while I expect:
> > 1
> > 4
> > ...
> > ... (I don't get the registers.. Although it isn't necessary for me right
> > now, could you maybe explain this as well if you have the time? I think it
> > has something to do with back referencing, but I'm not sure.)
> >
> >
> > Also, when I do this:
> >
> > (scan "[\xD8-\xF6]*" "<test>")
> > 0
> > 6
> > #()
> > #()
> >
> > while I expect to get nil.
> >
> > It seems as if the scanner doesn't do anything if the first character is
> > part of the regex in the first example (because if I add a angular bracket
> > to the front it does find it) and in the second it matches everything while
> > the hexcode range is far outside the strings range so it shouldn't find
> > anything. Am I doing something wrong?
> >
> >
> > Greatings,
> > Noldus
> >
> > _______________________________________________
> > cl-ppcre-devel site list
> > cl-ppcre-devel at common-lisp.net
> > http://common-lisp.net/mailman/listinfo/cl-ppcre-devel
> >
> 
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