using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
 
public class Test
{
	public static void Main()
	{
		var numAlpha = new Regex(@"(?<Numeric>[0-9]*\.?[0-9]+)(?<Alpha>[a-z]+)", RegexOptions.IgnoreCase);
		var match = numAlpha.Match("1.65B");
		if (match.Success) 
		{
			var number = match.Groups["Numeric"].Value;
			var alpha = match.Groups["Alpha"].Value;
	        Console.WriteLine("Number: {0}, Alpha: {1}", number, alpha);
		}
	}
}

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