/* 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
{
{
String s
= "nileshkemse@gmail.com"; System.
out.
println(s.
replaceAll("(^[^@]{3}|(?!^)\\G)[^@]",
"$1*"));
}
}
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