regexp: use slices to simplify the code

Replace some "reflect.DeepEqual" calls in the tests with
"slices.Equal" which is much faster for slice comparisons.

Remove unnecessary "runeSlice" and redundant helper functions.

Change-Id: Ib5dc41848d7a3c5149f41701d60471a487cff476
GitHub-Last-Rev: 87b5ed043d2935b971aa676cc52b9b2c5b45736b
GitHub-Pull-Request: golang/go#66509
Reviewed-on: https://go-review.googlesource.com/c/go/+/573977
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: qiulaidongfeng <2645477756@qq.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@golang.org>
4 files changed
tree: 9aa53b7e23eb108df1667b8ddae76e914abec141
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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