regex - Removing the url from text using java

Question

How to remove the URLs present in text example

String str="Fear psychosis after #AssamRiots - http://www.google.com/LdEbWTgD http://www.yahoo.com/mksVZKBz";

using a regular expression?

I want to remove all the URLs in the text. But it's not working, my code is :

String pattern = "(http(.*?)\s)";
Pattern pt = Pattern.compile(pattern);
Matcher namemacher = pt.matcher(input);
if (namemacher.find()) {
  str=input.replace(namemacher.group(0), "");
}

Answer 1

Input the String that contains the url

private String removeUrl(String commentstr)
    {
        String urlPattern = "((https?|ftp|gopher|telnet|file|Unsure|http):((//)|(\\))+[\w\d:#@%/;$()~_?\+-=\\\.&]*)";
        Pattern p = Pattern.compile(urlPattern,Pattern.CASE_INSENSITIVE);
        Matcher m = p.matcher(commentstr);
        int i = 0;
        while (m.find()) {
            commentstr = commentstr.replaceAll(m.group(i),"").trim();
            i++;
        }
        return commentstr;
    }