How to extract certain values from url using regex?

Question

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Most optimal way to parse querystring within a string in C#

I have the following url which I get as an input.

string strInput = @"http://ping.com/default.aspx?
val=88.998~98.3399&val=12.55_14.55&val=8.299&val=7.299&val=9.299";

I want to extract values 88.998 ,98.3399 and 7.299.Sometimes these values might be empty. I tried the pattern @"(?\=<val1>\d+\~$)" for extracting 88.998 , but it didn't work. And also I am not able to get other two values 98.3399 and 7.299.

Don't reinvent the wheel! Use a library. What you want to do is called *URL parsing*, specifically, the bit after the question mark is called the *querystring*. — Colonel Panic, Jan 26 '13 at 18:44
What is your actual problem? Trying to pars Url with Regex adds more than standard +1 problem - ["want to do it with regex - now you have two problems"](http://regex.info/blog/2006-09-15/247). — Alexei Levenkov, Jan 26 '13 at 18:44

score 2 · Answer 1 · edited May 23 '17 at 11:49

2

See https://stackoverflow.com/a/1206659/284795

You can do it this way:

using System.Collections.Specialized;

NameValueCollection query = HttpUtility.ParseQueryString(queryString);
Response.Write(query["id"]);

Hope it helps.

edited May 23 '17 at 11:49

Community

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answered Jan 26 '13 at 18:45

Colonel Panic

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+1 for finding the right question. Consider editing and adding the remaining part to use `String.Split("~")` to separate pairs of numbers from query parameter... – Alexei Levenkov Jan 26 '13 at 18:49
Looks like 100% copy paste from http://stackoverflow.com/a/1206659/284795 – Sergey Berezovskiy Jan 26 '13 at 18:49

How to extract certain values from url using regex?

1 Answers1