如何提取nsstring中的数据?

您可能正在查找此实例方法:

- (NSArray *)componentsSeparatedByString:(NSString *)separator

如果这不能满足你的需求,你想要更强大的东西,我个人可以推荐 RegexKitLite . regexkitlite以类别的形式向nsstring添加正则表达式的强大功能。

为了方便起见,我在nsstring中添加了一个类别(class:nsstring+实用程序):

- (NSString *)substringFromFirstOccurenceOfString:(NSString *)string {
    NSRange range = [self rangeOfString:string];

    if (range.location != NSIntegerMax) {
        int index = range.location + range.length;
        return [self substringFromIndex:index];
    } else {
        return self;
    }
}

- (NSString *)substringFromLastOccurenceOfString:(NSString *)string {
    NSRange range = [self rangeOfString:string options:NSBackwardsSearch];

    if (range.location != NSIntegerMax) {
        int index = range.location + range.length;
        return [self substringFromIndex:index];
    } else {
        return self;
    }
}

- (NSString *)substringToFirstOccurenceOfString:(NSString *)string {
    NSRange range = [self rangeOfString:string];    

    if (range.location != NSIntegerMax) {
        int index = range.location + range.length;
        return [self substringToIndex:index];            
    } else {
        return self;
    }
}

- (NSString *)substringToLastOccurenceOfString:(NSString *)string {
    NSRange range = [self rangeOfString:string options:NSBackwardsSearch];  

    if (range.location != NSIntegerMax) {
        int index = range.location;
        return [self substringToIndex:index];       
    } else {
        return self;
    }
}