$ is part of the regular expression. It matches the end of the line. ^
matches the beginning
So, '^polls/(\d+)/$' would match
polls/1234/
but not
polls/1234/1
because the ending is wrong, and not
the_polls/1234/
because the beginning is wrong
You can read more about this at http://docs.python.org/lib/re-syntax.html
Here's how it looks at the command line:
>>> import re
>>> spam=re.compile(r'^polls/(\d+)/$')
>>> print spam.match('polls/1234/')
<_sre.SRE_Match object at 0x00AD54A0>
>>> print spam.match('polls/1234/1')
None
>>> print spam.match('the_polls/1234/')
None
Since django stops matching urls after the first match, if you leave the
$ off the first one will match. That's why it doesn't continue down the
line.
I hope this makes sense. Regular expressions sometimes take a while to
get your head around. Read the docs some and play with them. Once they
click, they *really* click, so don't be afraid to take some time.
--B
John M wrote:
>Ok, so im gong through the turtorial and trying to adopt it to my own
>project, and I see this in urlpatterns:
>
>(r`^polls/$'....),
>(r'^polls/(\d+)/$'....)
>
>how does that differ from
>
>(r'^polls/'....),
>(r'^polls/(\d+)/$'....)
>
>Note the $ is missing from the first line of the second example.
>
>When you don't have a $ in the polls/ setup, it doesn't scan down to
>the other entries.
>
>Since I'm so new to python and web stuff, was wondering if anyone could
>explain this.
>
>Sorry for such a noob question.
>
>Thanks
>
>John
>
>
>>
>
>
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