Java String is it possible to go through the entire string sequentially and find a match?

Question

Java

For example in the string "qwertyqw". If I meet "qwe", then I need to replace it with "1", and if "ty", then replace it with 2. And in the end it should turn out: "1r2qw".

Answer 1

regular expressions to help you

Answer 2

Overheard from a friend: "If you have a problem that you want to solve with regular expressions, you already have two problems."
Try like this:
"qwertyqw".replace("qwe", "1").replace("ty", "2");