/* 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 s = "one=1&two=2&=3&tr=";
		Pattern patt = Pattern.compile("(?:\\w+=\\w*|=\\w+)(?:&(?:\\w+=\\w*|=\\w+))*");
		Matcher m = patt.matcher(s);
		if(m.matches()) {
			System.out.println("true");
		} else {
			System.out.println("false");
		}
 
 
	}
}

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