At this point I always love to refer to http://rubular.com, which is a
very good regular expression editor and tester.
leon
On Aug 11, 1:42 am, Tim Chase <django.us...@tim.thechases.com> wrote:
> > If i have a URL such as:
>
> > (r'^(?P<username>\w+)/blog/', include('foo.urls.blog')),
>
> > what are the whats the purpose of the w and the +? i'm having some
> > problems with 2 of my urls and i think it may have something to do
> > with this.
>
> You'll want to read up on regular expressions. There are a
> number of good tutorials and books on the subject. In short, in
> this case the "\w" is "any 'word' character" (usually
> [a-zA-Z0-9_] and if the regexp is compiled with unicode support,
> I believe it supports unicode "letter/digit" type characters).
> Note that this *doesn't* include things like the minus sign, the
> "@", and a variety of other characters you might wish to include
> in a username.
>
> The "+" is the "one-or-more of the previous atom [the '\w']"
> repetition operator. So your regexp is "one or more 'word'
> characters, followed by a slash, followed by the literal 'blog',
> followed by another slash".
>
> Regexps are very powerful, though the regexp-reversing code in
> Django doesn't gracefully handle some of the more complex cases
> because it's a non-trivial problem.
>
> -tkc
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