RegEx to make a ReturnURL optional

Making a ReturnURL optional

I need to assert that the URL has one of the following:
  • a goto
  • a returnurl
  • no return url or goto

How do I change this RegEx

            string regEx = @"https?://(" + redirectWhitelist + ")/\\?(goto|returnurl)=https?://(" + redirectWhitelist + ")";

to permit making the following portion to be optional?
                                                                                                     \\?(goto|returnurl)=https?://(" + redirectWhitelist + ")";

newbiewebSr. Software EngineerAsked:
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aikimarkConnect With a Mentor Commented:
string regEx = @"https?://(" + redirectWhitelist + ")/?((goto|returnurl)=https?://(" + redirectWhitelist + "))?";

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newbiewebSr. Software EngineerAuthor Commented:
So, it was a matter of putting the whole text inside () and following with a ?
newbiewebSr. Software EngineerAuthor Commented:
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