using System;
using System.Text.RegularExpressions;


namespace ConsoleApplication6
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(ReadDouble("xxx","xxx   =   24124,34"));
            Console.WriteLine(ReadDouble("xxx", "xxx   =   24124,34e-6"));
            Console.WriteLine(ReadDouble("xxx", "xxx   =   -24124,34"));
            Console.WriteLine(ReadDouble("xxx", "xxx   =   +24124,34"));
            Console.WriteLine(ReadDouble("xxx", "xxgx   =   24124,34"));
        }

        static double ReadDouble(string name, string wholeFile)
        {
            string pattern = name + @"\s*=\s*([+-]?\d+((\,\d+)([eE]-?\d+)?)?)\s*$";
            string someDouble= Regex.Match(wholeFile, pattern).Groups[1].Value;
            return someDouble == string.Empty ? 0d:double.Parse(someDouble);
        }
    }
}