When we want to add users to certain groups, spaces, or do anything that has to do with permissions, we have the option to search for users. Whenever you are able to search for users within Confluence, a magnifying glass icon will be shown. When we click on this icon, a new pop up will be shown, giving us the following two options to search for users:
Note that the search is not case sensitive; it doesn't make a difference if you type either upper- or lowercase text. Wildcards are supported but there is no need to use them, the search will return the same results.