How would you find and return a player with only part of their name?

The find function of the string library can be used to check if a string contains another string and you can make the check not case sensitive by using the lower case versions of both strings.

To check if the string source is part of the name of a player player, you can use player.Name:lower():find(source:lower(), 1, true). This will evaluate to true if the lower case name of the player contains the lower case string. The true in the last argument is there in order to tell the find function that it should not use string patterns and the 1 preceding it is there because the initial position must be given when a plain match is performed (which is the case here because the last argument is true).