Uses CMU's Pocketsphinx to do a quick speech-to-text transcription, then grep that transcript. It then takes any found text, extracts the sentence in question from the audio stream and saves it as a separate mp3.
A website into which you paste some text and then interactively click the parts you want to filter for. It builds you regular expressions in several programming languages that you can use as-is and They Just Work(tm).
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