regex - How do I replace part of a string in C#?

Question

Supposed I have the following string:

string str = "<tag>text</tag>";

And I would like to change 'tag' to 'newTag' so the result would be:

"<newTag>text</newTag>"

What is the best way to do it?

I tried to search for <[/]*tag> but then I don't know how to keep the optional [/] in my result...

Answer 1

Why use regex when you can do:

string newstr = str.Replace("tag", "newtag");

or

string newstr = str.Replace("<tag>","<newtag>").Replace("</tag>","</newtag>");

Edited to @RaYell's comment