Finding text between tags and replacing it along with the tags

Question

I am using The following regex pattern to find text between [code] and [/code] tags:

(?<=[code]).*?(?=[/code])

Answer 1

You need to use back referencing, i.e. replace \[code\](.*?)\[/code\] with something like <code>$1</code> which will give you what's been enclosed by the [code][/code] tags enclosed in -- for this example -- <code></code> tags.

Answer 2

Use this:

var s = "My temp folder is: [code]Path.GetTempPath()[/code]";

var result = Regex.Replace(s, @"\[code](.*?)\[/code]",
    m =>
        {
            var codeString = m.Groups[1].Value;

            // then you have to evaluate this string
            return EvaluateMyCode(codeString)
        });

Answer 3

I would use a HTML Parser for this. I can see that what you are trying to do is simple, however these things have a habit to get much more complicated overtime. The end result is much pain for the poor sole who has to maintain the code in the future.

Take a look at this question about HTML Parsers
What is the best way to parse html in C#?

[Edit]
Here is a much more relevant answer to the question asked. @Milad Naseri regex is correct you just need to do something like

string matchCodeTag = @"\[code\](.*?)\[/code\]";
string textToReplace = "[code]The Ape Men are comming[/code]";
string replaceWith = "Keep Calm";
string output = Regex.Replace(textToReplace, matchCodeTag, replaceWith);

Check out this web sites for more examples
http://www.dotnetperls.com/regex-replace
http://oreilly.com/windows/archive/csharp-regular-expressions.html

Hope this helps