There's no such thing in several backends.
That being said, I don't see the issue using requires=IS_UPPER() or 
requires=IS_LOWER()

On Wednesday, December 2, 2015 at 8:59:49 AM UTC+1, Encompass solutions 
wrote:
>
> I am not sure this exists yet, but it would be nice to take a string field 
> (or anything string like) and make it case insensitive.  That way I don't 
> have to worry the j...@example.com <javascript:> is the same as 
> j...@example.com
> What do you guys think?
>

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