URL

This example shows how anytype can be used for adding a custom validation to a flag.

1. Run go run . --auth user:pass, and see it prints:

user:pass

1. Run go run . --auth user:, and see it prints:

Error: invalid argument "user:" for "--auth" flag: password is required

1. Run go run . --auth :pass, and see it prints:

Error: invalid argument "user:" for "--auth" flag: password is required