//OC获取中间的字符串
NSString *middleStr;
//获取中间的字符串
NSString *frontStr = @"id";
//从该字符开始
NSString *behindStr = @"?";
//到该字符结束
NSRange range;
range.location = [string rangeOfString:frontStr].location + frontStr.length;
range.length = [string rangeOfString:behindStr].location - range.location;
middleStr = [NSString stringWithFormat:@"%@", [string substringWithRange:range]];
NSLog(@"%@",middleStr);
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