I have a bunch of files named similar to this:
How would you replace
I've googled this problem and tried literally 5+ solutions, non of which worked on mac.
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Unless you need a solution you can use in a script, you can do this directly in Finder.
If your not familier with terminal or scripts, you can use the mac app called NameChanger (free to use). You can change almost everything in batch on filenames / file extentions.