boolean checkEmail(String s){
String regex="[a-zA-Z][\\w_]+@\\w+(\\.\\w+)+";
Pattern p=Pattern.compile(regex);
Matcher m=p.matcher(s);
return m.matches();
}
String regex="[a-zA-Z][\\w_]+@\\w+(\\.\\w+)+";
Pattern p=Pattern.compile(regex);
Matcher m=p.matcher(s);
return m.matches();
}
String[]a =s.split(".");
if(a.length()!=2 ) System.out.println("error");
if(!a[0].contains("@")) System.out.println("error");