The old regex was not allowing numbers in the filenames.
Change-Id: Ic16de247f9caadefda6d6eb05896923ba4399ba5
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/66441
Commit-Queue: Ben Clayton <bclayton@google.com>
Kokoro: Ben Clayton <bclayton@google.com>
Reviewed-by: David Neto <dneto@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>