[Tutor] Replacing part of a URL

[Shashwat Anand]

>>> url = 'http://www.somesite.com/some/path/to/something.html'
>>> var = 'anotherthing'
>>> i = url.rfind('/') + 1
>>> j = url.rfind('.')
>>> if i < j:
...     newurl = url[:i] + var + url[j:]
... else:
...     newurl = url[:i] + var
>>> newurl
'http://www.somesite.com/some/path/to/anotherthing.html'

Changing the url to 'http://www.somesite.com/some/path/to/something' we get
newurl as 'http://www.somesite.com/some/path/to/anotherthing'

However if you are absolutely sure the pattern is '
http://www.somesite.com/some/path/to/something.html' , then you can simply
write one-liner as:
>>> url[:url.rfind('/') + 1] + var + url[url.rfind('.'):]
'http://www.somesite.com/some/path/to/anotherthing.html'

Literally the same stuff. I don't think you need regex for such simple
string manipulation.

~l0nwlf


On Sun, Feb 21, 2010 at 4:04 AM, Lao Mao <laomao1975 at googlemail.com> wrote:

> Hello,
>
> I need to be able to replace the last bit of a bunch of URLs.
>
> The urls look like this:
>
> www.somesite.com/some/path/to/something.html
>
> They may be of varying lengths, but they'll always end with
> .something_or_other.html
>
> I want to take the "something" and replace it with something else.
>
> My current plan is to simply do a string.split("/")[-1]
>
> and then another .split('.') to result in ['something', 'html'], and then
> replace sometihing, and join them together again.
>
> But - wouldn't it make more sense to do this with re.sub?
>
> In which case, how would I specify only the bit between the last / and the
> .html?
>
> Thanks,
>
> Laomao
>
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