Seeing as you asked for a C# example, Case Insensitive can be selected as one of the RegexOptions
.
I assumed the 13
was also meant to be a 2 digit number.
using System.Text.RegularExpressions;
...
Regex regX = new Regex(
@"(\d{1,2}):(\d{1,2})-([a-z]{2})-(\d{3,5})",
RegexOptions.IgnoreCase
);
if( regX.IsMatch( inputString ) )
{
// Matched
}
...
solved Regex for this string format