Regex for URL Validation

Question

HI I am validating a field which takes a url as input from the user.So the url may contain http,https,ftp links or the user may specify the ip address.So can anyone please help me out to create a suitable regex for that.I just need to check the validness of link and not that it exists or not.

Answer 1

here i have changed the regex as suggested by you but
it returns true even for http://com.com@
which is invalid.
So it did not worked :-(It did not work, because you did not use it correct:
public class Foo {
    private static boolean isValidUrl(String url) {
        return url.matches("(https?|ftp)://www\\.\\w+\\.\\w+");
    public static void main(String[] args) {
        String[] urls = {
                "http://com.com@",
                "http://www.com.com",
                "http://www.com.nl",
                "http://www.com.co.uk",
                "http://www.com"
        for(String url : urls) {
            System.out.println(url+" valid? "+isValidUrl(url));
}