/* package whatever; // don't place package name! */
 
import java.util.*;
import java.util.regex.*;
import java.lang.*;
import java.io.*;
 
/* 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
	{
		Pattern p = Pattern.compile("(^[^@]{5,}@[^@]*)@");
		String a = "abcde@varun@gmail.com";
		String b = "abcd@varun@gmail.com";
		Matcher m = p.matcher(a);
		if (m.find()) {
			a = m.group(1);
		}
		m = p.matcher(b);
		if (m.find()) {
			b = m.group(1);
		}
		System.out.println(a);
		System.out.println(b);
	}
}

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