test: edit regex for rc naming for useragent tests

[JenniferMah]

Fixes

A short description of what this PR does.

Checklist

• [x] I acknowledge that all my contributions will be made under the project's license
• [ ] I have made a material change to the repo (functionality, testing, spelling, grammar)
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• [ ] I have added tests that prove my fix is effective or that my feature works
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• [ ] I have added inline documentation to the code I modified

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