Why output of this code is 9955?

Question

I don't know why output of this code is 9955!
The code:
String s = "java99sl55";
System.out.println(s.replaceAll("[^0-9]",""));
Who can explain it to me?
https://code.sololearn.com/cjhnPouItK3l/?ref=app

Answer 1

Tax!
Your answer was helpful.

Answer 2

Is it for ^ ?