parsing of Images tag from the string in + iphone

- (NSString *)getFirstImage:(NSString *)htmlString{
  NSString *urlImage=nil;
    NSScanner *theScanner = [NSScanner scannerWithString:htmlString];
    // find start of IMG tag
    [theScanner scanUpToString:@"<img" intoString:nil];
    do {
        [theScanner scanUpToString:@"src" intoString:nil];
        NSCharacterSet *charset = [NSCharacterSet characterSetWithCharactersInString:@"\"'"];
        [theScanner scanUpToCharactersFromSet:charset intoString:nil];
        [theScanner scanCharactersFromSet:charset intoString:nil];
        [theScanner scanUpToCharactersFromSet:charset intoString:&urlImage];

        if([urlImage rangeOfString:@"imagebutton.gif"].location == NSNotFound) return urlImage;


    }while (![theScanner isAtEnd]  );


    if([theScanner isAtEnd]) return nil;
     return urlImage;
}