get a field

[mierdatutis mi]

Hi,

I have this:

pe="
http://www.rtve.es/mediateca/videos/20100211/saber-comer---patatas-castellanas-costillas-11-02-10/691046.shtml
"


I would like to extract this: 691046.shtml

But is dynamically. Not always have the same lenght the string.

Could you help me how could I do extract this in python?

Many thanks and sorry for my English!
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