"https://www.google.com/search?client=firefox-b-d&q=%3A}O"
SendKeys.SendWait(txt)
System.ArgumentException: 'SendKeys string 'https://www.google.com/search{?}client=firefox{-}b{-}d{&}q={%}3A}O' is not valid.'
Regex specialChar = new Regex(@"^[a-zA-Z0-9_@.-]*$");
{ and }
var
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