TD-4624 Add regex validation of professional registration number field throughout the application

DigitalLearningSolutions.Web.Tests/Controllers/Register/RegisterDelegateByCentreControllerTests.cs

@@ -176,7 +176,7 @@ public void LearnerInformationPost_updates_tempdata_correctly()
             const string answer4 = "answer4";
             const string answer5 = "answer5";
             const string answer6 = "answer6";
-            const string professionalRegistrationNumber = "PRN1234";
+            const string professionalRegistrationNumber = "PR123456";
             var model = new LearnerInformationViewModel
             {
                 JobGroup = jobGroupId,

DigitalLearningSolutions.Web.Tests/Controllers/TrackingSystem/Delegates/EditDelegateControllerTests.cs

@@ -175,7 +175,12 @@ public void Index_post_returns_view_with_model_error_with_invalid_prn()
                 result.As<ViewResult>().Model.Should().BeOfType<EditDelegateViewModel>();
                 AssertModelStateErrorIsExpected(
                     result,
-                    "Invalid professional registration number format - Only alphanumeric characters (a-z, A-Z and 0-9) and hyphens (-) allowed"
+                    "Invalid professional registration number format. " +
+        "Valid formats include: 7 digits (e.g., 1234567), 1–2 letters followed by 6 digits (e.g., AB123456), " +
+        "4–8 digits, an optional 'P' plus 5–6 digits, 'C' or 'P' plus 6 digits, " +
+        "an optional letter plus 5–6 digits, 'L' plus 4–6 digits, " +
+        "or 2 digits followed by a hyphen and 4–5 alphanumeric characters (e.g., 12-AB123)."
+
                 );
                 A.CallTo(() => userService.GetDelegateById(A<int>._)).MustNotHaveHappened();
             }

DigitalLearningSolutions.Web.Tests/Helpers/ProfessionalRegistrationNumberHelperTests.cs

@@ -70,7 +70,7 @@ public void ValidateProfessionalRegistrationNumber_does_not_set_errors_when_vali
         {
             // Given
             var state = new ModelStateDictionary();
-            const string validPrn = "abc-123";
+            const string validPrn = "AB123456";
 
             // When
             ProfessionalRegistrationNumberHelper.ValidateProfessionalRegistrationNumber(
@@ -106,19 +106,34 @@ public void ValidateProfessionalRegistrationNumber_sets_error_when_hasPrn_is_not
 
         [TestCase(null, "Enter a professional registration number")]
         [TestCase("", "Enter a professional registration number")]
-        [TestCase("123", "Professional registration number must be between 5 and 20 characters")]
-        [TestCase("0123456789-0123456789", "Professional registration number must be between 5 and 20 characters")]
+        [TestCase("1234", "Professional registration number must be between 5 and 20 characters")]
+        [TestCase("1234", "Professional registration number must be between 5 and 20 characters")]
         [TestCase(
             "01234_",
-            "Invalid professional registration number format - Only alphanumeric characters (a-z, A-Z and 0-9) and hyphens (-) allowed"
+         "Invalid professional registration number format. " +
+        "Valid formats include: 7 digits (e.g., 1234567), 1–2 letters followed by 6 digits (e.g., AB123456), " +
+        "4–8 digits, an optional 'P' plus 5–6 digits, 'C' or 'P' plus 6 digits, " +
+        "an optional letter plus 5–6 digits, 'L' plus 4–6 digits, " +
+        "or 2 digits followed by a hyphen and 4–5 alphanumeric characters (e.g., 12-AB123)."
+
         )]
         [TestCase(
             "01234 ",
-            "Invalid professional registration number format - Only alphanumeric characters (a-z, A-Z and 0-9) and hyphens (-) allowed"
+          "Invalid professional registration number format. " +
+        "Valid formats include: 7 digits (e.g., 1234567), 1–2 letters followed by 6 digits (e.g., AB123456), " +
+        "4–8 digits, an optional 'P' plus 5–6 digits, 'C' or 'P' plus 6 digits, " +
+        "an optional letter plus 5–6 digits, 'L' plus 4–6 digits, " +
+        "or 2 digits followed by a hyphen and 4–5 alphanumeric characters (e.g., 12-AB123)."
+
         )]
         [TestCase(
             "01234$",
-            "Invalid professional registration number format - Only alphanumeric characters (a-z, A-Z and 0-9) and hyphens (-) allowed"
+          "Invalid professional registration number format. " +
+        "Valid formats include: 7 digits (e.g., 1234567), 1–2 letters followed by 6 digits (e.g., AB123456), " +
+        "4–8 digits, an optional 'P' plus 5–6 digits, 'C' or 'P' plus 6 digits, " +
+        "an optional letter plus 5–6 digits, 'L' plus 4–6 digits, " +
+        "or 2 digits followed by a hyphen and 4–5 alphanumeric characters (e.g., 12-AB123)."
+
         )]
         public void ValidateProfessionalRegistrationNumber_sets_error_when_prn_is_invalid(
             string prn,

DigitalLearningSolutions.Web/Helpers/ProfessionalRegistrationNumberHelper.cs

@@ -1,7 +1,7 @@
 namespace DigitalLearningSolutions.Web.Helpers
 {
-    using System.Text.RegularExpressions;
     using Microsoft.AspNetCore.Mvc.ModelBinding;
+    using System.Text.RegularExpressions;
 
     public class ProfessionalRegistrationNumberHelper
     {
@@ -48,13 +48,17 @@ public static void ValidateProfessionalRegistrationNumber(
                 );
             }
 
-            const string pattern = @"^[a-z\d-]+$";
+           const string pattern = @"^(\d{7}|[A-Za-z]{1,2}\d{6}|\d{4,8}|P?\d{5,6}|[C|P]\d{6}|[A-Za-z]?\d{5,6}|L\d{4,6}|\d{2}-[A-Za-z\d]{4,5})$";
             var rg = new Regex(pattern, RegexOptions.IgnoreCase);
             if (!rg.Match(prn).Success)
             {
                 modelState.AddModelError(
                     "ProfessionalRegistrationNumber",
-                    "Invalid professional registration number format - Only alphanumeric characters (a-z, A-Z and 0-9) and hyphens (-) allowed"
+                   "Invalid professional registration number format. " +
+        "Valid formats include: 7 digits (e.g., 1234567), 1–2 letters followed by 6 digits (e.g., AB123456), " +
+        "4–8 digits, an optional 'P' plus 5–6 digits, 'C' or 'P' plus 6 digits, " +
+        "an optional letter plus 5–6 digits, 'L' plus 4–6 digits, " +
+        "or 2 digits followed by a hyphen and 4–5 alphanumeric characters (e.g., 12-AB123)."
                 );
             }
         }