:justtag
@sha256:ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
repo@sha256:ffffffffffffffffffffffffffffffffff
test:5000/repo@sha256:FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
Uppercase:tag
test:5000/Uppercase/lowercase:tag
a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a:tag
aa/asdf$$^/aa
[2001:db8::1]
[2001:db8::1]:5000
[2001:db8::1]:tag
[fe80::1%eth0]:5000/repo
[fe80::1%@invalidzone]:5000/repo