邮箱格式校验:正则
public static void main(String[] args) {
String emailPatten="(^?:[a-zA-Z0-9]+[_\\-+.]?)*[a-zA-Z0-9]+@(?:([a-zA-Z0-9]+-?)*[a-zA-Z0-9]+\\.)+([a-zA-Z]{2,})+$";
String b="R9XY002@frEejob.cc";
System.out.println(Pattern.matches(emailPatten, b));
}