question: public static boolean isValidEmail ( String email ) { final String emailPattern = "^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$" ; Matcher matcher ; Pattern pattern = Pattern . compile ( emailPattern ) ; matcher = pattern . matcher ( email ) ; if ( matcher != null ) return matcher . matches ( ) ; else return false ; }
target:  Checks if the input parameter is a valid email.