Question

I have a string like:

string originalStringBefore = "http://www.abc.com?a=||ThisIsForRndNumber||&qq=hello&jj=||ThisIsForRndNumberAlso||";

I want every string which comes between || to be replaced with a random number.

Now, the random number generation is easy, but i can’t find the way to write a Regular expression to search the string using a pattern and replace it.

I don’t want to do it by string manipulation functions.

Expected Solution/ outcome:

string originalStringAfter = "http://www.abc.com?a=||254877787||&qq=hello&jj=||6594741454||";

Answer 1

string originalStringBefore = "http://www.abc.com?a=||ThisIsForRndNumber||&qq=hello&jj=||ThisIsForRndNumberAlso||";

Random r = new Random();
Regex rgx = new Regex(@"\|\|.*?\|\|");
Console.WriteLine(rgx.Replace(originalStringBefore, "||" + r.Next(int.MaxValue) + "||"));