c# Regex match and replace using function

Question

/// 

/// Given HTML overlay for an image in the store, render it.
/// [p:n] renders as price for item ID n
/// 
/// Rendere         


        

Answer 1

You can only use the $1 notation if the replacement argument is a string, so you ended up passing $1 as a literal string to the int.Parse method.

Instead, use the (String, String, MatchEvaluator) overload with an anonymous method:

Regex.Replace(overlayHTML, pattern, 
match => FormatCurrency(GetItemPriceOnDate(DateTime.Now, currencyID, int.Parse(match.Groups[1].Value)))
)

Answer 2

I'm not totally sure I understand you, so bear with me if I am off.

 Console.WriteLine(int.Parse("$1"));  //throws exception Input string was not in a correct format.

 Console.WriteLine(int.Parse("$1".Replace("$", "")));  //Result: 1

If Store.CommonFunctions.GetItemPriceOnDate returns a string, you should be good to go.