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I think you can apply a regex expression on the field - something - like allow 4 chars only no, with the first letter being capital or like all smalleters or something and then in the name of the field give them a hint like Favorite Food (all small letters)

I know it's not great - but that's how I worked it out.

/^[a-z]{4}/
like this will match only 4 letter combination and will take a-z at the beginning of the string . Will not allow caps

this is a Test right here

Will match only "this"

Highly recommend http://www.rubular.com/ - to test your ruby regex.

TKS Nick!

But it's not what I'm looking for, but it can be a solution. I'll try study source code and find out a solutions.

Yeah I agree that a predefined dropdown easier but at least you can validate data...