Check whether List of String is Valid Email or not in Grails

Hello guys recently I was blocked in email verification and I was not interested to do with the regular expression because in some cases it was failed to validate. I found some classes to validate emails easily. Please refer the code

Step 1:- import

	import org.apache.commons.validator.routines.EmailValidator

Step 2:-
If you have data in the param then

    Boolean isValid       
    List<String> emailList = param.emailList.split(",") 
    EmailValidator emailValidator = EmailValidator.getInstance() 
    for (int i = 0; i < emailTarget.size(); i++) { 
        isValid = emailValidator.isValid(emailTarget[i]) 
        if (!validation) { 
            break 
        } 
    }

or

    EmailValidator emailValidator = EmailValidator.getInstance() 
    StringTokenizer st=new  StringTokenizer(param.emailList,”,”)	
    while(st.hasMoreToken()) {
	isValid = emailValidator.isValid(st.nextToken()); 
        if (!isValid) { 
            break 
        } 
    }

Step 3:-

if(isValid) {
    //Do your operation...
}