Check Valid Email Address c#

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private static bool IsValidEmailAddress(string EmailId)
{
const string pattern = @"^(?!\.)(""([^""\r\\]|\\[""\r\\])*""|" + @"([-a-z0-9!#$%&'*+/=?^_`{|}~]|(?<!\.)\.)*)(?<!\.)" + @"@[a-z0-9][\w\.-]*[a-z0-9]\.[a-z][a-z\.]*[a-z]$";
var regex = new Regex(pattern, RegexOptions.IgnoreCase);
return regex.IsMatch(EmailId);
}

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