public static void main(String[] args) {
        String regEx1 = "^([a-z0-9A-Z]+[-|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$";
        Pattern p = Pattern.compile(regEx1);
        Matcher m = p.matcher("test");
        if(m.matches()){
            System.out.println(true);
        }else{
            System.out.println(false);
        }
    }

var reg= /^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-])+/;
var mail = ‘test@1.co‘;
console.log(reg.test(mail));