常用正则表达式

/**
 *  手机号码验证
 *
 *  @param mobileNumbel 传入的手机号码
 *
 *  @return 格式正确返回YES  错误 返回 NO
 */
+ (BOOL) isMobile:(NSString *)mobileNumbel
{
    /**
     * 手机号码
     * 移动：134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188
     * 联通：130,131,132,152,155,156,185,186
     * 电信：133,1349,153,180,189,181(增加)
     * 新增：14_,17_
     */
    NSString * MOBIL = @"^1(3[0-9]|4[0-9]|5[0-35-9]|7[0-9]|8[025-9])\\d{8}$";
    /**
     10         * 中国移动：China Mobile
     11         * 134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188
     12         */
    NSString * CM = @"^1(34[0-8]|(3[5-9]|5[017-9]|8[2378])\\d)\\d{7}$";
    /**
     15         * 中国联通：China Unicom
     16         * 130,131,132,152,155,156,185,186
     17         */
    NSString * CU = @"^1(3[0-2]|5[256]|8[56])\\d{8}$";
    /**
     20         * 中国电信：China Telecom
     21         * 133,1349,153,180,189,181(增加)
     22         */
    NSString * CT = @"^1((33|53|8[019])[0-9]|349)\\d{7}$";

    NSPredicate *regextestmobile = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", MOBIL];
    NSPredicate *regextestcm = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM];
    NSPredicate *regextestcu = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU];
    NSPredicate *regextestct = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT];

    if (([regextestmobile evaluateWithObject:mobileNumbel]
         || [regextestcm evaluateWithObject:mobileNumbel]
         || [regextestct evaluateWithObject:mobileNumbel]
         || [regextestcu evaluateWithObject:mobileNumbel])) {
        return YES;
    }

    return NO;
}
/**
 *  密码验证
 *
 *  @param password 传入的密码 6-16位 大小写数字
 *
 *  @return 格式正确返回YES  错误 返回 NO
 */
+ (BOOL) isPassword:(NSString *)password
{

    NSString *pwd = @"^[a-zA-Z0-9]{6,16}$";

    NSPredicate *regextestPwd = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",pwd];

    if ([regextestPwd evaluateWithObject:password]) {

        return YES;
    }
    return NO;
}
/**
 *  邮箱验证
 *
 *  @param email 传入的邮箱
 *
 *  @return 格式正确返回YES  错误 返回 NO
 */
+ (BOOL) isEmail:(NSString *)email
{
    NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";

    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];

    if ([emailTest evaluateWithObject:email]) {

        return YES;
    }
    return NO;
}
/**
 *  身份证号验证
 *
 *  @param identityCard 传入的身份证号
 *
 *  @return 格式正确返回YES  错误 返回 NO
 */
+ (BOOL) isIdentityCard: (NSString *)identityCard
{

    NSString *idnum = @"^(\\d{14}|\\d{17})(\\d|[xX])$";

    NSPredicate *identityCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",idnum];

    return [identityCardPredicate evaluateWithObject:identityCard];
}
/** 银行卡号有效性问题Luhn算法
 *  现行 16 位银联卡现行卡号开头 6 位是 622126～622925 之间的，7 到 15 位是银行自定义的，
 *  可能是发卡分行，发卡网点，发卡序号，第 16 位是校验码。
 *  16 位卡号校验位采用 Luhm 校验方法计算：
 *  1，将未带校验位的 15 位卡号从右依次编号 1 到 15，位于奇数位号上的数字乘以 2
 *  2，将奇位乘积的个十位全部相加，再加上所有偶数位上的数字
 *  3，将加法和加上校验位能被 10 整除。
 */
+ (BOOL) isBankCardluhmCheck:(NSString *)bankNumber
{
    NSString * lastNum = [[bankNumber substringFromIndex:(bankNumber.length-1)] copy];//取出最后一位
    NSString * forwardNum = [[bankNumber substringToIndex:(bankNumber.length -1)] copy];//前15或18位

    NSMutableArray * forwardArr = [[NSMutableArray alloc] initWithCapacity:0];
    for (int i=0; i<forwardNum.length; i++) {
        NSString * subStr = [forwardNum substringWithRange:NSMakeRange(i, 1)];
        [forwardArr addObject:subStr];
    }

    NSMutableArray * forwardDescArr = [[NSMutableArray alloc] initWithCapacity:0];
    for (int i = (int)(forwardArr.count-1); i> -1; i--) {//前15位或者前18位倒序存进数组
        [forwardDescArr addObject:forwardArr[i]];
    }

    NSMutableArray * arrOddNum = [[NSMutableArray alloc] initWithCapacity:0];//奇数位*2的积 < 9
    NSMutableArray * arrOddNum2 = [[NSMutableArray alloc] initWithCapacity:0];//奇数位*2的积 > 9
    NSMutableArray * arrEvenNum = [[NSMutableArray alloc] initWithCapacity:0];//偶数位数组

    for (int i=0; i< forwardDescArr.count; i++) {
        NSInteger num = [forwardDescArr[i] intValue];
        if (i%2) {//偶数位
            [arrEvenNum addObject:[NSNumber numberWithInteger:num]];
        }else{//奇数位
            if (num * 2 < 9) {
                [arrOddNum addObject:[NSNumber numberWithInteger:num * 2]];
            }else{
                NSInteger decadeNum = (num * 2) / 10;
                NSInteger unitNum = (num * 2) % 10;
                [arrOddNum2 addObject:[NSNumber numberWithInteger:unitNum]];
                [arrOddNum2 addObject:[NSNumber numberWithInteger:decadeNum]];
            }
        }
    }

    __block  NSInteger sumOddNumTotal = 0;
    [arrOddNum enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        sumOddNumTotal += [obj integerValue];
    }];


    __block NSInteger sumOddNum2Total = 0;
    [arrOddNum2 enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        sumOddNum2Total += [obj integerValue];
    }];

    __block NSInteger sumEvenNumTotal = 0 ;
    [arrEvenNum enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        sumEvenNumTotal += [obj integerValue];
    }];


    NSInteger lastNumber = [lastNum integerValue];

    NSInteger luhmTotal = lastNumber + sumEvenNumTotal + sumOddNum2Total + sumOddNumTotal;

    return (luhmTotal%10 ==0)?YES:NO;
}
@end

原文：http://www.cnblogs.com/xiao-love-meng/p/5757486.html