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Regex reg = new Regex(@"a(\d+)");
string a = reg.Replace("a1200",new MatchEvaluator(RegexReplace));
Console.WriteLine(a);
private string RegexReplace(Match m)
{
double returnString = 0;
string matchValue = m.Groups[1].Value;
returnString = Convert.ToDouble(matchValue) / 500;
return returnString.ToString();
}