c# how to get src from html img
string str = "<div> <img src="https://i.testimg.com/images/g/test/s-l400.jpg" style="width: 100%;"> <div>Test</div> </div>";
// Get the index of where the value of src starts.
int start = str.IndexOf("<img src="") + 10;
// Get the substring that starts at start, and goes up to first ".
string src = str.Substring(start, str.IndexOf(""", start) - start);