Regarding use of replace function.

Question

Dear all,

I hope you are doing well. I have developed one component using Angular 7 and ASP .Net MVC with Rest Api.

I am using editor to save some text entered by user. To print that text I am using Crystal report.

I am saving data entered by user as it is with html tags. For printing purpose I am using text interpretaion as HTML Text.

I want to replace that string like this :-

<em><span style="text-decoration : underline">Hello</span></em>

with :-

<i><u>Hello</u></i>

How can I do that with Formula in Crystal report or string.Replace() of C#.

What will be Regex if I want to use in C#. 

Please let me know any solution on this problem.

Thanking you in advance.

Regards.