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Using regular expression on string for use in C#

I'm trying to extract a url from a string.
{ns:"images",k:"5127",mid:"A04F21EB77CF61E10E43BA33CF1986CA44357448"
,md5:"e2987d19c953bd836ec8fd2e0aa8492",surl:"http://someURLIdontwant/"
,imgurl:"http://THISISTHEURLINEED.jpg",tid:"OIP.Me2987d199c953bd836ec8fd2e0aa8492H0"
,ow:"300", docid:"608010036892077154",oh:"225",tft:"49"}
So it is located after "imgurl:". I am no expert on Regex and all I could produce is:
imgurl:'(.*)',tid
whitch worked on some online regex tester. But not the way I'm using it in C# apperantly.
webClient.DownloadFile(System.Text.RegularExpressions.Regex.Match
(stringWithText, "imgurl:'(.*)',tid").Groups[1].Value,"path\file.jpg");
Can it be done? Thanks

As #WiktorStribiżew already pointed out: The expression is almost correct. Use this instead:
Regex.Match(stringWithText, "imgurl:\"(.*)\",tid").Groups[1].Value
Example on dotNetFiddle
And as I mentioned earlier in a comment: You should parse the Json data instead.

Retrieve array from string with regular expression in C#

I have following string:
"option1,option2->data1,data2,data3,..."
I'm learning C# and also regular expressions, so I thought I might have some fun with it, but I can't figure out how to get an array from this.
For example, I'd like to retrieve array of strings that looks like this one:
[option1,option2,data1,data2,data3,...]
Here's regular expression I wrote in regex tester (.+),(.+)->((.+),?), but I'm not sure if this will work. And also I don't know how to use regex functions in C# to achieve this. I guess I should use something from System.Text.RegularExpressions but I'm not really sure what.
Long story short:
I want to get array from string using regular expressions.
"option1,option2->data1,data2,..." -> [option1,option2,data1,data2,...]
Thanks!

I would avoid RegularExpressions for this. you can simply do this:
string[] myArray = inputString.Replace("->", ",").Split(',');

It seems like you need direction more than an answer.
http://www.RegexHero.com is a good place to test your regex against strings.
http://www.mikesdotnetting.com/Article/46/CSharp-Regular-Expressions-Cheat-Sheet is a cheat sheet/guide for c# regex
http://www.dotnetperls.com/regex-match here's a good place to start with regex in c#

You haven't posed anything that string.Split can't handle:
var split = given.Split(new [] {",", "->"}, StringSplitOptions.None);

Equivalent of Substring as a RegularExpression

Ok, I need a general regular expression that will give me the x characters from a string starting at position y like the string's substring function:
input_str.Substring(y,x)
But as a C# regular expression.
Example:
1234567890 Substring(5,3) 678
I know you are thinking why not just use the Substring function? The short answer is because this goes as a data for an existing function and in this context it would be inelegant to create a whole separate data parsing mechanism. We'd like to get this working without changing the code.
I feel like this is really obvious--but I'm pretty inexperienced with regular expressions. Thanks in advance for any help.

.{y}(.{x}).* should do it, I think, then just pull out the capture group.

Regex Regular expression in c#

We have implemented the invocation of brill tagger from our c# code. We just neede to know what is the correct Regex regular expression for eliminating all from a string, but jst keep a-z,A-Z, full stop and comma. We tried [^a-zA-Z\.\,] on the online regular expression tester and it is giving the correct result, but when implemented in C#, it is not working properly. We also tried several other combinations but we are not getting the correct result.
This is the format in which we are writing:
strFileContent = Regex.Replace(strFileContent, #"[^a-zA-Z\.\,]", "");
but we are not getting the desired output. what is wrong??

Regex.Replace(yourString, #"[^a-z\.\,]", string.Empty, RegexOptions.IgnoreCase)
EDIT: I can't see anything wrong with what you are doing, my answer is exactly the same. I tested both in LINQPad and they both return the same result.

What is C# equivalent of preg_match_all?

The theme is i opened a file and get all it's data into string and i am matching this string with the regex returning none. But the same regex in PHP is returning values for the same text using preg_match_all. Anyone having a idea?

The method in .NET that’s closest to preg_match_all() is the static Regex.Matches(String,String) call, or the equivalent Matches method on a compiled regular expression. It returns a MatchCollection that you can use to count the matches and to loop over each one.
Can you provide some short, self-contained code to show what’s not working?

There is a Regex.Matches method in C# that you can use.