C++ strings

Hey /prog/,

I need your help. I'm a beginner in C++ and I've been doing some exercises. I got stuck when asked to find a word made only with vowels. So far my program can find all vowels in the text but I've no idea how check if a word consists only of vowels.
I'm working with STL strings. I've tried google but everything's too confusing to me atm.

Please help.

>>1
:3 mfw I realise that innocent soul of OP is currently being corrupted by C++ strings. No \b[aoieu]+\b regexpes for him! :3:3:3

>>10
Let's fork(2) him.