Java regular expression form verification tool class of of verification mailbox mobile phone number qq number etc

Java USES regular expressions for form validation tool class, you can verify email, mobile phone number, qq number, etc

package util;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class RegexValidateUtil {
    static boolean flag = false;
    static String regex = "";
    public static boolean check(String str, String regex) {
 try {
     Pattern pattern = Pattern.compile(regex);
     Matcher matcher = pattern.matcher(str);
     flag = matcher.matches();
 } catch (Exception e) {
     flag = false;
 }
 return flag;
    }
    
    public static boolean checkNotEmputy(String notEmputy) {
 regex = "^\s*$";
 return check(notEmputy, regex) ? false : true;
    }
    
    public static boolean checkEmail(String email) {
 String regex = "^\w+[-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$ ";
 return check(email, regex);
    }
    
    public static boolean checkCellphone(String cellphone) {
 String regex = "^((13[0-9])|(14[5|7])|(15([0-3]|[5-9]))|(18[0,5-9]))\d{8}$"; 
 return check(cellphone, regex);
    }
    
    public static boolean checkTelephone(String telephone) {
 String regex = "^(0\d{2}-\d{8}(-\d{1,4})?)|(0\d{3}-\d{7,8}(-\d{1,4})?)$";
 return  check(telephone, regex);
    }
    
    public static boolean checkFax(String fax) {
 String regex = "^(0\d{2}-\d{8}(-\d{1,4})?)|(0\d{3}-\d{7,8}(-\d{1,4})?)$"; 
 return check(fax, regex);
    }

    
    public static boolean checkQQ(String QQ) {
 String regex = "^[1-9][0-9]{4,} $";
 return check(QQ, regex);
    }
}