Reference

String Methods

Methods for string manipulation.

1. string.find

   Search for a pattern in a Lua string and return the start and end positions. Supports Lua patterns or plain literal search via the optional plain argument.

   string.find(s, pattern [, init [, plain]])
2. string.gsub

   Replace pattern matches in a Lua string. Accepts a literal replacement, a table lookup, or a function that returns the replacement for each match.

   string.gsub(s, pattern, repl [, n])