截取指定字符串

NSString *string = @"abavavasdsvx,as.dsf/,.[abcdefghijklmn]dgdfg";

NSRange start = [string rangeOfString:@"["];

 NSRange end = [string rangeOfString:@"]；

 NSString *sub = [string substringWithRange:NSMakeRange(start.location, end.location-start.location+1)];

NSLog(@"sub=%@",sub);

控制台就输出:[abcdefghijklmn]