用正則表示式判斷字串是否為手機號：

- (BOOL)isPhoneNumber:(NSString *)str {
    NSString * MOBILE = @"^1(3[0-9]|5[0-35-9]|8[025-9])\\d{8}$";
    NSString * CM = @"^1(34[0-8]|(3[5-9]|5[017-9]|8[278])\\d)\\d{7}$";
    NSString * CU = @"^1(3[0-2]|5[256]|8[156])\\d{8}$";
    NSString * CT = @"^1((33|53|8|7[09])[0-9]|349)\\d{7}$"
 
;

    NSPredicate *regextestmobile = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", MOBILE];
    NSPredicate *regextestcm = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM];
    NSPredicate *regextestcu = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU];
    NSPredicate *regextestct = [NSPredicate predicateWithFormat:@"SELF MATCHES %@"
 
, CT];
    BOOL res1 = [regextestmobile evaluateWithObject:str];
    BOOL res2 = [regextestcm evaluateWithObject:str];
    BOOL res3 = [regextestcu evaluateWithObject:str];
    BOOL res4 = [regextestct evaluateWithObject:str];

    if (res1 || res2 || res3 || res4 ) {
        return YES;
    } else {
        return
 
 NO;
    }
}

用正則表示式判斷字串是否為郵箱：

- (BOOL)isEmail:(NSString *)str {
    NSString *emailRegex = @"[A-Z0-9a-z._%+-][email protected][A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
    return [emailTest evaluateWithObject:str];
}

用正則表示式判斷字串是否為身份證號：

- (BOOL) isValidateIdentityCard: (NSString *)identityCard
{
    BOOL flag;
    if (identityCard.length <= 0) {
        flag = NO;
        return flag;
    }
    NSString *regex2 = @"^(\\d{14}|\\d{17})(\\d|[xX])$";
    NSPredicate *identityCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2];
    return [identityCardPredicate evaluateWithObject:identityCard];
}