public (bool isValid, List <string> invalidPlaceholders) ContainsUnknownPlaceholders(string source)
{
var usedPlaceholders = source.GetPlaceholders();
var validPlaceholders = Placeholder.All();
var unknownPlaceholders = new List <string>();
foreach (var placeholder in usedPlaceholders)
{
if (!validPlaceholders.Contains(placeholder))
{
unknownPlaceholders.Add(placeholder);
}
}
return(!unknownPlaceholders.Any(), unknownPlaceholders);
}
