String search

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Is there a simple way to search a file for a variable length string in a
file?

What I'm trying to do is download an html document off the internet, and
search the file for a string like:
"http://www.whatever.com/bleh/picture*.jpg", where the * is a pair of
numbers that change daily.  If I could easily extract that, then it's
trivial to download the image.

If anyone's interested, it's a program to download the current strip from
User Friendly, http://www.userfriendly.org/, and place it as your desktop
background.

Regards,
Greg

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