Fixing regex util

[peteruithoven]

Should fix: #6385
Credits for fix go to @tshinnic

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[SimenB]

Thanks! Mind adding a test which breaks without this change? We could add an assertion like expect(() => new RegExp(the regex)).not.toThrow() in the suite for jest-regex-util.

Although it seems the failing test is just fixed? Maybe just updating that assertion is the correct fix.

https://github.com/facebook/jest/blob/d1ce3cd0135b5a8b64f84998fd5f36be4afb2bef/packages/jest-regex-util/src/__tests__/index.test.js#L35-L40

@thymikee @seanpoulter thoughts?

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