looking for a simple input/output program to clean up data

i'm looking for a basic txt program that would take a lump of text and remove everything exept certian phrases.

for example lets say we have this:

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Code (markup):

and i wanted to remove everything execpt this:

http://i.imgur.com/bVfOC.gif

Code (markup):

is there anything out there already and if not i'm willing to buy a small simple program thats capable of this type of cleaning up.

thanks