Text Replacement using RegEx

[rmeshksar]

Hi,
I would like to do text replacement using RegEx and use the following statement:
Regex.Replace(input, pattern, replacement, RegexOptions.IgnoreCase)

It works fine in all cases except in the following scenario.

Replacement of a text with a curreny value:
Example:
decimal total = 100;
string sTotal = string.Format("{0:c}", total);
string replaced = Regex.Replace("Total = ::total::", "::total::", sTotal, RegexOptions.IgnoreCase);

It returns: Total = $100.00 which is fine.

Now if the total is zero (Just Zero) it returns:
Total = ::total::.00

I do not know wht it does not work with zero.

Any help would be appreciated.