A string is a sequence of characters, for example "Hello, World!" is a string.
Here is a list of every default string manipulation function present in Lua.

• string.byte
• string.char
• string.dump
• string.find
• string.format
• string.gmatch
• string.gsub
• string.len
• string.lower
• string.match
• string.rep
• string.reverse
• string.sub
• string.upper