Regular expression question

Question

string text = "Please contact us by phone [phone]) or by email at [email protected] or at [email protected]. This is not email: test@test. This also: @gmail.com. Neither this: [email protected].";

string format = "^[a-zA-Z]{1,15}.[a-zA-Z]{1,15}@[a-zA-Z]{1,10}.(com|in|org|co|uk).(uk)$";

MatchCollection first = Regex.Matches(text, format, RegexOptions.None);

Console.WriteLine(first[0]);

Console.WriteLine(first[1]);

 

 

My xpected output is  [email protected] and [email protected]..

But i am not getting pls help