Possible to 'grep' a sound-bite from an audio mp3 file ?

Hello,

Is there a Linux tool that can retrieve sound-bites from an audio mp3 file given a sound pattern to search ? Consider over a hundred mp3 files of media announcements by one or more public figures where I want to 'grep' out particular spoken words eg any spoken instances of the words rice, drought and water etc. The analogous function is pdfgrep to pdf files as a way of finding pertinent documents.

Thanks,
Fabian