import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String text = String.join("\n",
			"ERROR java.lang.NullPointerException: Sample Java Logback Exception",
			"at Sample.errorLevel3(Sample.java:35)",
			"at Sample.errorLevel4(Sample.java:34)",
			"at Sample.errorLevel5(Sample.java:30)",
			"at Sample.errorLevel6(Sample.java:3)"
		);
        String pattern = "(?:^.*\\s([^:,\\s]+):\\s+([^:\\n]+)|\\G(?!\\A))\\s*at\\s+(\\S+)\\((\\w+\\.\\w+):(\\d+)\\)$";
        Pattern regex = Pattern.compile(pattern, Pattern.MULTILINE);
        Matcher m = regex.matcher(text);
        int matchNum = 0;
 
 
 		//Loop matches
        while (m.find())
        {
            matchNum++;
 
            // Loop groups
            for (int i = 1; i <= m.groupCount(); i++) 
            {
            	if (m.group(i) != null) {
	                System.out.println("Match " + matchNum + " - Group " + i + ": " + m.group(i));
            	}
            }
		}
	}
}
 

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