正则表达式

首先简单介绍一下正则表达式的基本写法及用法

d 匹配任何一个数字，即[0-9]

d+表示1个以上的数字

d*标示0个或多个数字

s 表示分隔符，包括空格、制表符和换行符

s* 0个或多个分隔符

w 表示字母、数字和下划线，这里还包括Unicode字符，不同的语言里有些不同

w{4} 表示4个非空白字符

. 表示任何一个字符，不包括换行符

.* 表示任何多个字符，当然也不包括换行符了

^([0-9]) 表示数字开头

([0-9])$ 表示数字结尾

([0-9A-Za-z]) 表示数字字母

| 表示或的关系，如d|w 表示数字或字母

(.|[rn])* 表示任何多个字符，包括换行符，贪婪扫描

(.|[rn])*? 表示任何多个字符，包括换行符，懒惰扫描

(?:.|[rn]) 以(?:开头时的分组信息，表示不读取到缓冲器里，避免rangeAtIndex调用时产生副作用，后面还会遇到这样的(?:写法

+ (BOOL) validateEmail:(NSString *)email
{
    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:email];
}
//手机号码验证
+ (BOOL) validateMobile:(NSString *)mobile
{
    //手机号以13， 15，18开头，八个 d 数字字符
    NSString *phoneRegex = @"^((13[0-9])|(15[^4,D])|(18[0,0-9]))d{8}$";
    NSPredicate *phoneTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",phoneRegex];
    return [phoneTest evaluateWithObject:mobile];
}
//车牌号验证
+ (BOOL) validateCarNo:(NSString *)carNo
{
    NSString *carRegex = @"^[u4e00-u9fa5]{1}[a-zA-Z]{1}[a-zA-Z_0-9]{4}[a-zA-Z_0-9_u4e00-u9fa5]$";
    NSPredicate *carTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",carRegex];
    NSLog(@"carTest is %@",carTest);
    return [carTest evaluateWithObject:carNo];
}
//车型
+ (BOOL) validateCarType:(NSString *)CarType
{
    NSString *CarTypeRegex = @"^[u4E00-u9FFF]+$";
    NSPredicate *carTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",CarTypeRegex];
    return [carTest evaluateWithObject:CarType];
}
//用户名
+ (BOOL) validateUserName:(NSString *)name
{
    NSString *userNameRegex = @"^[A-Za-z0-9]{4,20}+$";
    NSPredicate *userNamePredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",userNameRegex];
    BOOL B = [userNamePredicate evaluateWithObject:name];
    return B;
}
//密码
+ (BOOL) validatePassword:(NSString *)passWord
{
    NSString *passWordRegex = @"^[a-zA-Z0-9]{6,20}+$";
    NSPredicate *passWordPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",passWordRegex];
    return [passWordPredicate evaluateWithObject:passWord];
}
//昵称
+ (BOOL) validateNickname:(NSString *)nickname
{
    NSString *nicknameRegex = @"([u4e00-u9fa5]{2,5})(·[u4e00-u9fa5]{2,5})*";
    NSPredicate *passWordPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",nicknameRegex];
    return [passWordPredicate evaluateWithObject:nickname];
}
//身份证号
+ (BOOL) validateIdentityCard: (NSString *)identityCard
{
    BOOL flag;
    if (identityCard.length <= 0) {
        flag = NO;
        return flag;
    }
    NSString *regex2 = @"^(d{14}|d{17})(d|[xX])$";
    NSPredicate *identityCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2];
    return [identityCardPredicate evaluateWithObject:identityCard];
}
//银行卡
+ (BOOL) validateBankCardNumber: (NSString *)bankCardNumber
{
    BOOL flag;
    if (bankCardNumber.length <= 0) {
        flag = NO;
        return flag;
    }
    NSString *regex2 = @"^(d{15,30})";
    NSPredicate *bankCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2];
    return [bankCardPredicate evaluateWithObject:bankCardNumber];
}
//银行卡后四位
+ (BOOL) validateBankCardLastNumber: (NSString *)bankCardNumber
{
    BOOL flag;
    if (bankCardNumber.length != 4) {
        flag = NO;
        return flag;
    }
    NSString *regex2 = @"^(d{4})";
    NSPredicate *bankCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2];
    return [bankCardPredicate evaluateWithObject:bankCardNumber];
}
//CVN
+ (BOOL) validateCVNCode: (NSString *)cvnCode
{
    BOOL flag;
    if (cvnCode.length <= 0) {
        flag = NO;
        return flag;
    }
    NSString *regex2 = @"^(d{3})";
    NSPredicate *cvnCodePredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2];
    return [cvnCodePredicate evaluateWithObject:cvnCode];
}
//month
+ (BOOL) validateMonth: (NSString *)month
{
    BOOL flag;
    if (!month.length == 2) {
        flag = NO;
        return flag;
    }
    NSString *regex2 = @"(^(0)([0-9])$)|(^(1)([0-2])$)";
    NSPredicate *monthPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2];
    return [monthPredicate evaluateWithObject:month];
}
//year
+ (BOOL) validateYear: (NSString *)year
{
    BOOL flag;
    if (!year.length == 2) {
        flag = NO;
        return flag;
    }
    NSString *regex2 = @"^([1-3])([0-9])$";
    NSPredicate *yearPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2];
    return [yearPredicate evaluateWithObject:year];
}
//verifyCode
+ (BOOL) validateVerifyCode: (NSString *)verifyCode
{
    BOOL flag;
    if (!verifyCode.length == 6) {
        flag = NO;
        return flag;
    }
    NSString *regex2 = @"^(d{6})";
    NSPredicate *verifyCodePredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2];
    return [verifyCodePredicate evaluateWithObject:verifyCode];
}

（编辑：李大同）

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