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C# - extracting string from this data...

Posted on 2013-06-25
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Last Modified: 2013-07-01
Hi,

I am writing a .net c# application.

I have the following string  called "content" which contains the following -

GET /cgi-bin/update.sh?name=Name1&ip= HTTP/1.1
Accept: */*
Accept-Language: en-us
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)
Host: 192.168.1.118
Connection: Keep-Alive

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What is the best way to extract "Name1" from the first line to another variable?

Thanks for any input
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Question by:mhdi
5 Comments
 
LVL 21

Assisted Solution

by:Dale Burrell
Dale Burrell earned 150 total points
ID: 39277094
Something like (might be out by 1 but you can adjust):

string Result = Content.Substring(Content.IndexOf("name=")+5);
Result = Result.Substring(0, Result.IndexOf("&"));

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Author Comment

by:mhdi
ID: 39277107
What does the +5 do?

The ID "Name1" will change and could be anywhere between 3 and 15 characters.

For that reason, I suspect this wont work for all instances?
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LVL 42

Assisted Solution

by:sedgwick
sedgwick earned 150 total points
ID: 39277130
here:
            string name = content.Split(new string[] { "&", "=", "?" }, StringSplitOptions.RemoveEmptyEntries)[2];

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LVL 21

Expert Comment

by:Dale Burrell
ID: 39277136
If you check out the reference for what IndexOf does you'll see it returns the index of the first character in the string being searched for. However you want the string that follows "name=" so you need to add 5 characters on to move from the start of "name=" to the end.

The code snippet I have written should definitely work, its looking for the first character following "name=" (which shouldn't change), through to the first "&", and therefore certainly handles any number of chars in-between.

I think you've confused yourself in your example by using name and name one as the variable name and value :)
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LVL 75

Accepted Solution

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käµfm³d   👽 earned 200 total points
ID: 39277655
The two suggestions above are plausible, but both make assumptions about the existence and position of the "name" parameter. If you are assured that "name" will always be the first parameter, and that there will always be at least two parameters, then they should work fine. However, if you are not assured of these conditions, then you are going to encounter issues. The following seems to account for these conditions:

string result = System.Text.RegularExpressions.Regex.Match(content, "(?<=name=)[^& ]+").Value;

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...where "result" will contain an empty string if "name" does not exist within the target string.
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