On Apr 10, 11:03 pm, jwkr...@shaw.ca ("John W. Krahn") wrote:
> cityuk wrote:
> > Dear All,
>
> Hello,
>
>
>
> > This is more of a generic question on regular expressions as my
> > program is working fine but I was just curious.
>
> > Say you have the following URLs:
>
> >http://www.test.com/image.gif
> >http://www.test.com/?src=image.gif?width=12
>
> > I want to get the type of the image, i.e. the string gif.
>
> > For the first URL the regular expression .*\.([a-z]{3}) will do the
> > trick while for the second one I am using .*=\([a-z]{3})?.*.
>
> > Ignoring the fact that the REs can be written better my question is:
>
> > If I put them together, that is write them as
>
> > .*\.([a-z]{3})|.*=\([a-z]{3})?.*
>
> > perl thinks that the or only applies to the characters immediately
> > surrounding it (in this case ) and .).
>
> No. The alternation applies to the complete pattern '.*\.([a-z]{3})' OR
OK. So if I understood you correctly, given the following (actual)
URLs
http://beta.images.theglobeandmail.com/archive/01258/election_heads__1258993cl-3.jpg
http://storage.canoe.ca/v1/dynamic_resize/?src=http://www.torontosun.com/news/decision2011/2011/04/06/300_harper_boring.jpg&size=248x186
the following pattern
^\s*.*\.([a-zA-z]{3})$ | ^\S*\?\S*\.([a-zA-z]{3})&.*$
should match them both. Am I correct?
Regards,
George
> '.*=\([a-z]{3})?.*'.
>
> John
> --
> Any intelligent fool can make things bigger and
> more complex... It takes a touch of genius -
> and a lot of courage to move in the opposite
> direction. -- Albert Einstein
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