[flexcoders] Using Flex to extract a phrase from a text file

[João]

I have one text file with about 100 lines of random text. Somewhere on
the file, there is an URL for a SWF. The url has the .swf word in it,
and it's between "'s . The format of the file can change over time,
and there is only one SWF file on the text file. 

I need to find the best algorithm to extract the URL from the text
file. Any suggestions?

Thanks, 

João Saleiro