Macro for Case Sensitive Text Search

This macro is working well but I have come across a snag where there may be times when a keyword must be case sensitive. For example one keyword is BAC but it is picking up simple words like back and such. This is the code I am using but not sure where and how to incorporate the case sensitive piece. Do I use an Exact or UCase function somewhere?

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Thank you so much! I believe that did the trick.