Port re2 regex tests #61896
Description
re2 has lots of regex functional tests we should port over to improve our coverage:
https://github.com/google/re2/blob/d826d9fcb68c62996c1b7c0a45d604e22d814952/re2/testing/
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re2 has lots of regex functional tests we should port over to improve our coverage:
https://github.com/google/re2/blob/d826d9fcb68c62996c1b7c0a45d604e22d814952/re2/testing/