Java Regex String Replace Last replaceLast(String string, String regex, String replacement)

Description

Works like String.replaceFirst, but replaces the last instance instead.

License

Open Source License

Parameter

Parameter	Description
string	a parameter
regex	a parameter
replacement	a parameter

Declaration

public static String replaceLast(String string, String regex, String replacement) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    /**/*from  w  w  w .  j a v a  2 s .  c o  m*/
     * Works like String.replaceFirst, but replaces the last instance instead.
     *
     * @param string
     * @param regex
     * @param replacement
     * @return
     */
    public static String replaceLast(String string, String regex, String replacement) {
        if (regex == null) {
            return string;
        }
        if (string == null) {
            return null;
        }
        if (regex.length() > string.length()) {
            //It can't be contained in here
            return string;
        }
        Matcher m = Pattern.compile(regex).matcher(string);
        int start = -1;
        int end = -1;
        while (m.find()) {
            start = m.start();
            end = m.end();
        }
        if (start == -1 || end == -1) {
            //Didn't find it, return the whole string
            return string;
        } else {
            return string.substring(0, start) + replacement + string.substring(end, string.length());
        }
    }
}

Related

1. replaceLast(String foo, String regex, String replacement)
2. replaceLast(String input, String regex, String replacement)