Regular Expression newbie question about upper & lower case

I want to check for both upper & lower case answers when a user keys in
a response to a question, but I haven't been able to find an example of
the syntax. What I'm looking for is something like this:

If $ans = [Yy]*

I know this syntax isn't correct, but what I want it to do is accept Y,
y, yes, YeS, yippee, etc. Would someone mind posting an example?
Thanks....
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