Fix a typographical error.
Fix a typographical error.

Change-Id: I94d226d246045141cb71b40d1f7520e35d2fbbf7
Reviewed-on: https://code-review.googlesource.com/14273
Reviewed-by: Paul Wankadia <62d4e38bb1380f055ec4b899baa75e52af09c5f7@google.com>

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