00000000-0000-0000-0000-000000000000
public static bool IsGUID(string expression) { if (expression != null) { Regex guidRegEx = new Regex(@"^(\{{0,1}([0-9a-fA-F]){8}-([0-9a-fA-F]){4}-([0-9a-fA-F]){4}-([0-9a-fA-F]){4}-([0-9a-fA-F]){12}\}{0,1})$"); return guidRegEx.IsMatch(expression); } return false; }
var
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