This freeware (for personal use) saved me dozens of hours renaming files: http://www.bulkrenameutility.co.uk/Screenshots.php
When installed, you can use the app or call it as a service.
Not sure if it's as full-featured as Bulk Rename Utility, but it's close. [regex replace is hidden under Advanced & Special, which will tell you a bit about their target market.]
* Available for OS X 10.[12]-11, and macOS 10.12