diff --git a/src/Application/Common/Validators/RegularExpressionValidation.cs b/src/Application/Common/Validators/RegularExpressionValidation.cs
index ed421450..4a636720 100644
--- a/src/Application/Common/Validators/RegularExpressionValidation.cs
+++ b/src/Application/Common/Validators/RegularExpressionValidation.cs
@@ -5,6 +5,12 @@ public static class ValidationConstants
         public const string LettersSpacesUnderscores = @"^[A-Za-z_ ]+$";
         public const string LettersSpacesUnderscoresMessage = "{0} must contain only letters, spaces, and underscores.";
 
+        public const string LettersSpacesCommaApostorphe = @"^[A-Za-z ',’]+$";
+        public const string LettersSpacesCommaApostropheMessage = "{0} must contain only letters, spaces, comma and an apostrophe.";
+
+        public const string AlphabetsDigitsSpaceSlashHyphenDot= @"^[a-zA-Z0-9\s\\\/\-.]+$";
+        public const string AlphabetsDigitsSpaceSlashHyphenDotMessage = "{0} must contain only alphabet (both uppercase and lowercase), digit, space, backslash, forward slash, hyphen, and dot.";
+
         public const string DateMustBeInPast = "Date must be in the past.";
         public const string DateMustBeInFuture = "Date must be in the future.";
 
@@ -13,6 +19,9 @@ public static class ValidationConstants
         
         public const string GuidMessage = "{0} must contain a valid Guid";
 
+        public const string Numbers = @"^[0-9]*$";
+        public const string NumbersMessage = "{0} must contain only numbers";
+
         public const string AlphaNumeric = @"^[a-zA-Z0-9]*$";
         public const string AlphaNumericMessage = "{0} must contain only alphanumeric characters";
         
@@ -30,8 +39,8 @@ public static class ValidationConstants
         public const int MaximumPageSize = 50;
         public const string MaximumPageSizeMessage = "Page size must be between 1 and 50.";
 
-        public const string TenantId = @"^[0-9]+(?:\\.[0-9]+)*\\.$";
-        public const string TenantIdMessage = "Must start with a number and end with a period for example 1.2.1.";
+        public const string TenantId = @"^(\d+(\.\d+)*\.)$";
+        public const string TenantIdMessage = "Invalid format for Tenant Id";
 
         public const string TenantDomain = @"^@[a-z0-9]+(?:[-]?[a-z0-9]+)*(?:\.[a-z0-9]+(?:[-]?[a-z0-9]+)*)+$";
         public const string TenantDomainMessage = "Must be in the format '@example.com'";
diff --git a/src/Application/Features/Identity/DTOs/ApplicationUserDtoValidator.cs b/src/Application/Features/Identity/DTOs/ApplicationUserDtoValidator.cs
index 022155bb..f37c8bd1 100644
--- a/src/Application/Features/Identity/DTOs/ApplicationUserDtoValidator.cs
+++ b/src/Application/Features/Identity/DTOs/ApplicationUserDtoValidator.cs
@@ -18,15 +18,10 @@ public ApplicationUserDtoValidator(
             .NotEmpty().WithMessage(_localizer["Tenant name is required"])
             .Matches(ValidationConstants.TenantId).WithMessage(_localizer[ValidationConstants.TenantIdMessage]);
 
-        RuleFor(x => x.ProviderId)
-            .MaximumLength(50).WithMessage(_localizer["Provider must be less than 50 characters"])
-            .NotEmpty().WithMessage(_localizer["Provider is required"])
-            .Matches(ValidationConstants.AlphaNumeric).WithMessage(_localizer[string.Format(ValidationConstants.AlphaNumericMessage, "Provider Id")]);
-
         RuleFor(x => x.DisplayName)
             .MaximumLength(100).WithMessage(_localizer["Display Name is required and must be less than or equal to 100 characters"])
             .NotEmpty().WithMessage(_localizer["Display Name is required"])
-            .Matches(ValidationConstants.AlphaNumeric).WithMessage(_localizer[string.Format(ValidationConstants.AlphaNumericMessage, "Display Name")]);
+            .Matches(ValidationConstants.NameCompliantWithDMS).WithMessage(_localizer[string.Format(ValidationConstants.NameCompliantWithDMSMessage, "Display Name")]);
 
         RuleFor(x => x.Email)
             .NotEmpty().WithMessage(_localizer["E-mail is required"])
@@ -58,14 +53,16 @@ public ApplicationUserDtoValidator(
 
         RuleFor(x => x.PhoneNumber)
             .MaximumLength(20).WithMessage(_localizer["Mobile number must be less than or equal to 20 digits"])
-            .Matches(ValidationConstants.AlphaNumeric).WithMessage(_localizer[string.Format(ValidationConstants.AlphaNumericMessage, "Mobile number")]);
+            .Matches(ValidationConstants.Numbers).WithMessage(_localizer[string.Format(ValidationConstants.NumbersMessage, "Mobile number")]);
 
         RuleFor(x => x.MemorablePlace)
             .MaximumLength(50).WithMessage(_localizer["Memorable place must be less than or equal to 50 characters"])
-            .Matches(ValidationConstants.AlphaNumeric).WithMessage(_localizer[string.Format(ValidationConstants.AlphaNumericMessage, "Memorable place")]);
+            .Matches(ValidationConstants.LettersSpacesCommaApostorphe).WithMessage(_localizer[string.Format(ValidationConstants.LettersSpacesCommaApostropheMessage, "Memorable place")]);
 
         RuleFor(x => x.MemorableDate)
-            .NotEmpty().WithMessage(_localizer["Memorable date is required"]);
+            .NotEmpty().WithMessage(_localizer["Memorable date is required"])
+            .MaximumLength(50).WithMessage(_localizer["Memorable place must be less than or equal to 50 characters"])
+            .Matches(ValidationConstants.AlphabetsDigitsSpaceSlashHyphenDot).WithMessage(_localizer[string.Format(ValidationConstants.AlphabetsDigitsSpaceSlashHyphenDotMessage, "Memorable date")]); ;
 
         RuleForEach(x => x.Notes).ChildRules(notes =>
         {