EmployeeEmail.java

package guru.springframework.unittest.asserts;

import java.util.HashMap;
import java.util.Map;
import  java.util.regex.*;

public class EmployeeEmail {
	//0312

    Map<String, String> hashMap = new HashMap<String, String>();

    public  void addEmployeeEmailId(String key, String value){
        if(isValidEmailId(value)) {
            hashMap.put(key, value);
        }
    }
    public String getEmployeeEmailId(Object key){
        if (!(key instanceof String)) {
            throw new IllegalArgumentException("Object not type of String");
        }
        return hashMap.get(key);
    }
    public boolean isValidEmailId(String email){
        String regex = "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@((\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\])|(([a-zA-Z\\-0-9]+\\.)+[a-zA-Z]{2,}))$";
        Pattern pattern = Pattern.compile(regex);
        Matcher m = pattern.matcher(email);
        return m.matches();
    }
}