check-ref-format Checks if a given refname is acceptable, and exits…
Checks if a given refname is acceptable, and exits with a non-zero status if it is not. More information: https://git-scm.com/docs/git-check-ref-format.
git check-ref-format {{refs/head/refname}}
git check-ref-format --branch @{-1}
git check-ref-format --normalize {{refs/head/refname}}