I will have a different type of string(string will not have fixed format,they will be different every time) from them I want to remove some specific substring.Like the string can be

OPTIDX 26FEB2009 NIFTY CE 2500
OPTIDX NIFTY 30 Jul 2009 4600.00 PE
OPTSTK ICICIBANK 30 Jul 2009 700.00 PA

I want to extract Rs.(digit) from those string and store it into one variable and then in those string there should not be Rs.(digit).

What should be the regex for that ?

EDIT

private string ExtractingRupeesFromString(String str)
{
    Match match = Regex.Match(cellRecord, @"(\d+(?:\.\d+)?)\D*$");
    return match.Value.ToString();
}