几种常用正则方法

1.检查邮箱。

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

2.检查身份证 ​

- (BOOL)cly_verifyIDCardString:(NSString *)idCardString {
    NSString *regex = @"^[1-9]\d{5}(18|19|([23]\d))\d{2}((0[1-9])|(10|11|12))(([0-2][1-9])|10|20|30|31)\d{3}[0-9Xx]$";
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
    BOOL isRe = [predicate evaluateWithObject:idCardString];
    if (!isRe) {
        //身份证号码格式不对
        return NO;
    }
    //加权因子 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2
    NSArray *weightingArray = @[@"7", @"9", @"10", @"5", @"8", @"4", @"2", @"1", @"6", @"3", @"7", @"9", @"10", @"5", @"8", @"4", @"2"];
    //校验码 1, 0, 10, 9, 8, 7, 6, 5, 4, 3, 2
    NSArray *verificationArray = @[@"1", @"0", @"10", @"9", @"8", @"7", @"6", @"5", @"4", @"3", @"2"];
    
    NSInteger sum = 0;//保存前17位各自乖以加权因子后的总和
    for (int i = 0; i < weightingArray.count; i++) {//将前17位数字和加权因子相乘的结果相加
        NSString *subStr = [idCardString substringWithRange:NSMakeRange(i, 1)];
        sum += [subStr integerValue] * [weightingArray[i] integerValue];
    }
    
    NSInteger modNum = sum % 11;//总和除以11取余
    NSString *idCardMod = verificationArray[modNum]; //根据余数取出校验码
    NSString *idCardLast = [idCardString.uppercaseString substringFromIndex:17]; //获取身份证最后一位
    
    if (modNum == 2) {//等于2时 idCardMod为10  身份证最后一位用X表示10
        idCardMod = @"X";
    }
    if ([idCardLast isEqualToString:idCardMod]) { //身份证号码验证成功
        return YES;
    } else { //身份证号码验证失败
        return NO;
    }
}

3.检查手机号

-(BOOL)checkPhoneNo
{
    NSString *regex = @"^(13[0-9]|14[579]|15[0-3,5-9]|16[6]|17[0135678]|18[0-9]|19[89])\d{8}$";
    NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
    
    return [pred evaluateWithObject:self];
}

4.是否包含大小写字母，数字以及特殊符号中三种。

- (BOOL) deptNumInputShouldNumber

{
    int count=0;
    int zm=0;
    int zm1=0;
    int zm2=0;
    int zm3=0;
    NSString * zmStr=@"qwertyuiopasdfghjklzxcvbnm";
    NSString * zm1Str=@"QWERTYUIOPASDFGHJKLZXCVBNM";
    NSString * zm2Str=@"1234567890";
    NSString * zm3Str=@"_~!@#$%^*?&";
    for (int i=0; i<self.length; i++) {
        NSString * str=[self substringWithRange:NSMakeRange(i, 1)];
        if ([zmStr containsString:str]) {
            if (zm==0) {
                zm=1;
                count+=1;
            }
        }
        if ([zm1Str containsString:str]) {
            if (zm1==0) {
                zm1=1;
                count+=1;
            }
        }
        if ([zm2Str containsString:str]) {
            if (zm2==0) {
                zm2=1;
                count+=1;
            }
        }
        if ([zm3Str containsString:str]) {
            if (zm3==0) {
                zm3=1;
                count+=1;
            }
        }
        
    }
    if (count>=3) {
        return YES;
    }else{
        return NO;
    }
       

}