正则表达式(系统)

第三方库正则表达式:用法 http://see.xidian.edu.cn/cpp/html/1435.html

//邮箱验证

- (BOOL)isValidateEmail:(NSString *)email

{

    NSString *emailRegex =@"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";

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

    return [emailTest evaluateWithObject:email];

}

//用户名

- (BOOL)validateUserName:(NSString *)name

{

    NSString *userNameRegex = @"^[A-Za-z0-9]{6,20}+$";

    NSPredicate *userNamePredicate = [NSPredicatepredicateWithFormat:@"SELF MATCHES %@",userNameRegex];

    BOOL B = [userNamePredicate evaluateWithObject:name];

    return B;

}

//昵称

- (BOOL)validateNickname:(NSString *)nickname

{

    NSString *nicknameRegex =@"^[/u4e00-/u9fa5]{4,8}$";

    NSPredicate *passWordPredicate = [NSPredicatepredicateWithFormat:@"SELF MATCHES %@",nicknameRegex];

    return [passWordPredicate evaluateWithObject:nickname];

}

//密码

-(BOOL)validatePassword:(NSString *)passWord

{

    NSString *passWordRegex = @"^[a-zA-Z0-9]{6,20}+$";

    NSPredicate *passWordPredicate = [NSPredicatepredicateWithFormat:@"SELF MATCHES %@",passWordRegex];

    return [passWordPredicate evaluateWithObject:passWord];

}

//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 = [NSPredicatepredicateWithFormat:@"SELF MATCHES %@",regex2];

    return [identityCardPredicate evaluateWithObject:identityCard];

}

//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 = [NSPredicatepredicateWithFormat:@"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 = [NSPredicatepredicateWithFormat:@"SELF MATCHES %@",carRegex];

    NSLog(@"carTest is %@",carTest);

    return [carTest evaluateWithObject:carNo];

}

 

//车型

- (BOOL)validateCarType:(NSString *)CarType

{

    NSString *CarTypeRegex = @"^[/u4E00-/u9FFF]+$";

    NSPredicate *carTest = [NSPredicatepredicateWithFormat:@"SELF MATCHES %@",CarTypeRegex];

    return [carTest evaluateWithObject:CarType];

}

//网址

- (BOOL)validateUrlString:(NSString *)urlString

{

    NSString *urlStringRegex =@"^([a-zA-Z]+://)?([\w-\.]+)(\.[a-zA-Z0-9]+)(:\d{0,5})?/?([\w-/]*)\.?([a-zA-Z]*)\??(([\w-]*=[\w%]*&?)*)$";

    NSPredicate *urlStringPredicate = [NSPredicatepredicateWithFormat:@"SELF MATCHES %@",urlStringRegex];

    return [urlStringPredicate evaluateWithObject:urlString];

}

1.利用NSPredicate（谓词）匹配

例如匹配有效邮箱：

NSString ＊email ＝ @“[e-mail]”；

    NSString *regex =@"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";

    NSPredicate *predicate = [NSPredicatepredicateWithFormat:@"SELF MATCHES %@", regex];

    BOOL isValid = [predicate evaluateWithObject:email];

谓词匹配比较灵活，但是需要有谓词的相关知识。

2.利用rangeOfString：option：直接查找

    NSString *searchText = @"// Do any additional setup after loading the view, typically from a nib.";

    NSRange range = [searchText rangeOfString:@"(?:[^,])*\\." options:NSRegularExpressionSearch];

    if (range.location != NSNotFound) {

        NSLog(@"%@", [searchText substringWithRange:range]);

    }

options中设定NSRegularExpressionSearch就是表示利用正则表达式匹配，会返回第一个匹配结果的位置。

3.使用正则表达式类

    NSString *searchText = @"// Do any additional setup after loading the view, typically from a nib.";    

    NSError *error = NULL;

    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"(?:[^,])*\\." options:NSRegularExpressionCaseInsensitive error:&error];

    NSTextCheckingResult *result = [regex firstMatchInString:searchText options:0 range:NSMakeRange(0, [searchText length])];

    if (result) {

        NSLog(@"%@\n", [searchText substringWithRange:result.range]);

    }

使用系统的正则表达式类（NSRegularExpression）会返回匹配的多个结果。

\[(\S*?)\]

#define FACE_ICON_NAME \[(\S*?)\]