This 5 minute roblox studio scripting tutorial covers what the string library is, and how to use it to do things like finding strings within other strings, finding the length of strings, making a string all lowercase or all uppercase & repeating a string several times.
0:00 Overview
0:28 string.find
1:17 string.len
1:36 string.lower
1:46 string.upper
2:41 string.rep