java replaceLast() [duplicate]

Answer 1

See for yourself: String

Or is your question actually "How do I implement a replaceLast()?"

Let me attempt an implementation (this should behave pretty much like replaceFirst(), so it should support regexes and backreferences in the replacement String):

public static String replaceLast(String input, String regex, String replacement) {
    Pattern pattern = Pattern.compile(regex);
    Matcher matcher = pattern.matcher(input);
    if (!matcher.find()) {
       return input;
    }
    int lastMatchStart=0;
    do {
      lastMatchStart=matcher.start();
    } while (matcher.find());
    matcher.find(lastMatchStart);
    StringBuffer sb = new StringBuffer(input.length());
    matcher.appendReplacement(sb, replacement);
    matcher.appendTail(sb);
    return sb.toString();
}