从NSString提取子字符串 [英] extract substring from NSString

问题描述

我想从NSString中提取子字符串.怎么可能.

I wants to extract substring from NSString. How it is possible.

示例:字符串为 abcdefwww.google.comabcdef

输出: www.google.com

在主字符串中，不是预定义哪个url来，可能是google.com或yahoo.com等.

In the main String, It is not predefined which url comes, It may be google.com or yahoo.com etc.

所以我必须在 www 中找到w的开始位置，并在 .com 中找到m的最后位置.

So I have to find the Start location of w in www and the the last location of m in .com.

所以我的问题是，如何在 www 中找到 w 的开始位置，以及在中找到 m 的位置.com ，所以我提取了这一部分

So my question is that how I can find the start location of w in www and the location of m in .com, so i extract this part

由于问题而

我们如何从asdfwww.mywebsite.co.ukasdfajsf这个字符串中提取www.mywebsite.co.uk

How we can extract www.mywebsite.co.uk from this string asdfwww.mywebsite.co.ukasdfajsf

谢谢

推荐答案

像波纹管这样的字符串中的子字符串

substring from string like bellow

       - (NSString *)extractString:(NSString *)fullString toLookFor:(NSString *)lookFor skipForwardX:(NSInteger)skipForward toStopBefore:(NSString *)stopBefore 
    {

        NSRange firstRange = [fullString rangeOfString:lookFor];
        NSRange secondRange = [[fullString substringFromIndex:firstRange.location + skipForward] rangeOfString:stopBefore];
        NSRange finalRange = NSMakeRange(firstRange.location + skipForward, secondRange.location + [stopBefore length]);

        return [fullString substringWithRange:finalRange];
    }

使用如下所示的方法...

use this method like below...

NSString *strTemp = [self extractString:@"abcdefwww.google.comabcdef" toLookFor:@"www" skipForwardX:0 toStopBefore:@".com"];
NSLog(@"\n\n Substring ==>> %@",strTemp);

有关更多信息，请参见下面的链接.

for more information see bellow link..

help-needed-function-extract-string-string

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