Replace text in StringBuilder via regex

Question

I would like to replace some texts in StringBuilder. How to do this?

In this code I got java.lang.StringIndexOutOfBoundsException at line with mat

Answer 1

You shouldn't do it this way. The input to Matcher may be any CharSequence, but the sequence should not change. Matching like you do is like iterating over a Collection while removing elements at the same time, this can't work.

However, maybe there's a solution:

while (matcher.find()) {
    sb.replace(matcher.start(), matcher.end(), "x");
    matcher.region(matcher.start() + "x".length(), sb.length());
}