Thanks much for the suggestions. I downloaded BBEdit and it does indeed have a very powerful search function that lets the user search across all open docs and find/replace so after using last night it appears to fulfill my needs. Thanks again!
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BBedit is like *the* text editor on Mac, even the free version is super powerful.
I am not sure about multi-tab-search, but it has a powerful multi-file-search – you basically throw a folder at it (or several) and can search them with numerous options and then view all the findings and edit right there…