You can use the ansible-galaxy command to search for roles. For example, running the following currently returns 725 roles:

$ ansible-galaxy search docker

If you want to search for a role by an author, you can use the following:

$ ansible-galaxy search --author=russmckendrick docker

As you can see from the output in the screenshot, this returns just the role we have published:

This is useful as you do not have to start switching between your terminal and browser.