using System;

using System.Text.RegularExpressions;

​

public class Program

{

    public static void Main()

    {

        //string text = "2 - May'04";

        //string text = "Apr. 2 '05";

        string text = "Mar. 2 to '05";

        string[] months = {"January", "Jan", "February", "Feb", "March", "Mar", "April", "Apr", "May", "June", "Jun", "July", "Jul", "August", "Aug", "September", "Sept", "Sep", "October", "Oct", "November", "Nov", "December", "Dec"};

        Regex regex;

        Match match;

        foreach (string m in months)

        {

                    //regex = new Regex(@"((\d{1,2})\s*[\-]\s*?" + m + @"[\-\,]? ?\'?(\d{2,4})\b)");

                    //regex = new Regex(@"\b("+m+@"\b.?(\d{1,2}) ?(\-|to|through)?(\d{1,2})?[\,\s]+\'?(\d2,4))");

                    regex = new Regex(@"\b(" + m + @"\b.? (\d{1,2}) ?(\-|to|through)[\,\s]+\'?(\d{2,4}))");

                    match = regex.Match(text);

                    if(match.Success)

                    {

                        int st = match.Length;

                        Console.WriteLine("case1:"+match.Value);

                        string completeDate = match.Groups[1].ToString();

                        int day1 = Convert.ToInt32(match.Groups[2].Value);

                        string day2 = match.Groups[3].ToString();

                        //int day2 = Convert.ToInt32(match.Groups[3].Value);

                        string key = string.Format("{0}-{1}", st, st+completeDate.Length);

                        Console.WriteLine(completeDate + "\tfirst:" + day1 + "\tsecond:" + day2);

​

                    }

            }

        }

    }

​