java replaceLast() [duplicate]

Answer 1

If you don't need regex, here's a substring alternative.

public static String replaceLast(String string, String toReplace, String replacement) {
    int pos = string.lastIndexOf(toReplace);
    if (pos > -1) {
        return string.substring(0, pos)
             + replacement
             + string.substring(pos + toReplace.length());
    } else {
        return string;
    }
}

Testcase:

public static void main(String[] args) throws Exception {
    System.out.println(replaceLast("foobarfoobar", "foo", "bar")); // foobarbarbar
    System.out.println(replaceLast("foobarbarbar", "foo", "bar")); // barbarbarbar
    System.out.println(replaceLast("foobarfoobar", "faa", "bar")); // foobarfoobar
}