Using "capitalize" filter in Function stack

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Sorry in advance if this question is a bit redundant. I try to build a search bar and in my endpoint, I have created a condition WHERE input: text "search" = db "projects.item" and so far so good - the results are returned if I type the exact wording, but I would like to let my end-users to search no matter if they type lowercase or uppercase.

How or what is the best practice for adding the capitalize filter in my function stack? 

Thanks a lot.

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