Add yet another test.
Add yet another test.

Change-Id: I2a35f135b9ef95bfeb10148f7dc425f3f3854508
Reviewed-on: https://code-review.googlesource.com/5248
Reviewed-by: Paul Wankadia <62d4e38bb1380f055ec4b899baa75e52af09c5f7@google.com>

google/re2,google/re2,google/re2,google/re2,google/re2