Parliamentary Archive references can now include both letters and numbers after the lettercode component e.g. YHC/CL/JO/1/1.

Author: Brian-O-TNA

book-a-reading-room-visit.web/Helper/Constants.cs

@@ -29,6 +29,6 @@ public class Constants
         public const string Invalid_Series_Reference = "The series reference you have entered has an invalid format.  Series references must start with 1-4 uppercase letters, followed by a space, then 1-4 digits";
 
         public const string Doc_Ref_Regex_General = @"^([^Yy\W][a-zA-Z]{1,3})\s*?(\d{1,4})/(.+)$";
-        public const string Doc_Ref_Regex_Parly_Archives = @"^(Y[a-zA-Z]{1,3})(\s1)?\/{1}(\d{1,4})/(.+)$";
+        public const string Doc_Ref_Regex_Parly_Archives = @"^(Y[a-zA-Z]{1,3})(\s1)?\/{1}(\w{1,4})/(.+)$";
     }
 }