Regular expression for matching date

I have no knowledge of regular expressions except using Regex library in C# , that too with pattern matching expressions searched from net.

I would like to have regex to match date in below two mentioned formats , no need for Year part.

8 October or 8 Oct

September 19 or Sep 19

Please help me out , searching Google hasn't helped me .

---

  string Date = "December 8"

  MatchCollection MC = Regex.Matches(Date, @"(?i)([d]{1,2}(s)?(January|Jan|February|feb|March|mar|April|Apr|May|June|July|August|Aug|September|Sep|October|Oct|November|Nov|December|Dec))|(January|Jan|February|feb|March|mar|April|Apr|May|June|July|August|Aug|September|Sep|October|Oct|November|Nov|December|Dec)(s)?[d]{1,2}");

---

Why struggle with regular expressions when the framework already provides you with the TryParseExact method which is designed to do exactly that:

public class Program
{
    static void Main()
    {
        var str = "8 October";
        DateTime date;
        var formats = new[] { "d MMMM", "d MMM" };
        if (DateTime.TryParseExact(str, formats, CultureInfo.InvariantCulture, DateTimeStyles.None, out date))
        {
            Console.WriteLine(date);
        }
        else
        {
            Console.WriteLine("The date was not in one of the 2 supported formats 'd MMMM' orr 'd MMM'");
        }
    }
}

You could even make it culture aware. For example let's suppose that you have french speaking users of your site that would probably write 8 Octobre instead of 8 October .

In this case you could specify the current culture or force a specific culture:

var str = "8 Octobre";
DateTime date;
var formats = new[] { "d MMMM", "d MMM" };
var ci = new CultureInfo("fr-FR");
if (DateTime.TryParseExact(str, formats, ci, DateTimeStyles.None, out date))
{
    // use the date instance here
}

Further reading: custom datetime formats.

---

Try this regex:

(?<month>[a-zA-Z]+)s+(?<day>d+)|(?<day>d+)s+(?<month>[a-zA-Z]+)

and get groups named: day and month

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