/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String str = "<55>Mar 17 12:02:00 forcesss-off [Father][1x91422234][eee][hote] abcd(QlidcxpOulqsf): highs(23455814)[mothers][192.192.21.12] ftid(64322816): oops authentication failed with (http-commo-auth, username='testuserMM' password='********'congratulation-fakem='login' )";
		String res = str.replaceAll(".*\\busername='([^']+)'.*", "$1");
		System.out.println(res);
 
		String rx = "(?<=\\busername=')[^']+";
		Pattern ptrn = Pattern.compile(rx);
        Matcher m = ptrn.matcher(str);
        while (m.find()) {
            System.out.println(m.group());
        }
	}
}

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