I was at BANG 33 yesterday, and one of the puzzles involved extracting words out of other words. We did the extraction by hand at the game, but today I set down at my desk and added a substring extractor to Puzzle Pal.
While I was at it, I also bundled the wordlist into the main app, and updated the UI to use action bar.
If you find Puzzle Pal useful, please review it on Google Play. You can also leave a comment here if you have ideas for other solvers and decoders.