Neatest way to do a case insensitive "in"?

[Albert Hopkins]

On Fri, 2009-03-13 at 21:04 +0000, tinnews at isbd.co.uk wrote:
> What's the neatest way to do the following in case insensitive fashion:-
> 
>     if stringA in stringB:
>         bla bla bla
> 
> I know I can just do:-
> 
>     if stringA.lower() in stringB.lower():
>         bla bla bla
> 
> But I was wondering if there's a neater/easier way?

How is "if stringA.lower() in stringB.lower():" complex/messy?