please help with simple regex

[viofis at my-deja.com]

I'm a beginner at Python, so this may be a stupid question:

I have a string, for example, myString="the Potato".
1. Convert it to all lowercase ("the potato")
2. Match it against a list of strings - "potato,tomato,corn,etc...",
extract "potato" (if it matches with something on the list), then save
into myNewString.

Any help is greatly appreciated.

thanks,
Vadim



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