ios - OC中搜索字符串有哪几种方法？哪种更高效一点？

Question

比如，找到"good bad ask com good fault good",字符串中所有的good的位置，请问哪些方法？
rangeOfString只返回匹配的第一个字符串的位置。

Answer 1

    NSString *text = @"good bad ask com good fault good";
    NSError *error;
    NSRegularExpression *regular = [[NSRegularExpression alloc] initWithPattern:@"good" options:NSRegularExpressionCaseInsensitive error:&error];
    if (!error) {
        NSArray *results = [regular matchesInString:text options:NSMatchingReportProgress range:NSMakeRange(0, text.length)];
        NSLog(@"%@", results);
    }
    else {
        NSLog(@"%@", error);
    }

Here is a good tutorial http://www.cocoachina.com/ios/20150415/11568.html