Search Strings Using Regular Expressions

Hi Friends ,

I Have Small Problem ,
 

string sample1 = "AK12-13/000000029024";
            string Patten1 = "^\\[A-Za-z]{2}-\\d{2}/\\d{12}$";
            System.Text.RegularExpressions.Match match1 = System.Text.RegularExpressions.Regex.Match(sample1, Patten1, System.Text.RegularExpressions.RegexOptions.IgnoreCase);
            if (!match1.Success)
            {
                MessageBox.Show("Please enter a valid  Patten.", "TEST", MessageBoxButtons.OK, MessageBoxIcon.Warning);
 
                return;
            }

 
But its not working , Any one Plz to Help
Condisions:
 
• The first two digits have to be Alphabets “AK”
• Secondly, the 5th character has to be a “-”
• Thirdly, the 8th character has to be a “/”
• Finally the last 12 characters after the 8th place onwards have to be numeric.