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 s = "[key1=value1, key2=value2, key 3= text,value # 3]";
		Pattern pattern = Pattern.compile("(\\w[^,=]*)=(.*?)(?=]|,\\s*\\w[^,=]*=)");
		Matcher matcher = pattern.matcher(s);
		while (matcher.find()){
			System.out.println("Key-value pair found:");
			System.out.println(matcher.group(1).trim());
			System.out.println(matcher.group(2).trim()); 
		} 
	}
}

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