Regex syntax error in c#?

Question

I am getting links in email.

 

there are two types of links, In some link there is = in link and sometime there is == in links

and its possible that there may be === in link how should I code for it.

 

Below is my code, please help me out of this problem?

 

This code will only work when there is one = at the end of the link, not when there are == or 

 

Regex emailRegex2 = new Regex(@"\b(?:https:\/\/www.xyz.com\/onlinedownload)\S+\b=", RegexOptions.Compiled | RegexOptions.IgnoreCase);