diff --git a/src/Umbraco.Infrastructure/DependencyInjection/UmbracoBuilder.CoreServices.cs b/src/Umbraco.Infrastructure/DependencyInjection/UmbracoBuilder.CoreServices.cs
index ef0e25204c60..83f43e099cd0 100644
--- a/src/Umbraco.Infrastructure/DependencyInjection/UmbracoBuilder.CoreServices.cs
+++ b/src/Umbraco.Infrastructure/DependencyInjection/UmbracoBuilder.CoreServices.cs
@@ -240,6 +240,7 @@ public static IUmbracoBuilder AddCoreInitialServices(this IUmbracoBuilder builde
         builder.Services.AddSingleton<IBlockEditorElementTypeCache, BlockEditorElementTypeCache>();
 
         builder.Services.AddSingleton<IRichTextRequiredValidator, RichTextRequiredValidator>();
+        builder.Services.AddSingleton<IRichTextRegexValidator, RichTextRegexValidator>();
 
         return builder;
     }
diff --git a/src/Umbraco.Infrastructure/PropertyEditors/RichTextPropertyEditor.cs b/src/Umbraco.Infrastructure/PropertyEditors/RichTextPropertyEditor.cs
index 772e72283377..902f9da3c24f 100644
--- a/src/Umbraco.Infrastructure/PropertyEditors/RichTextPropertyEditor.cs
+++ b/src/Umbraco.Infrastructure/PropertyEditors/RichTextPropertyEditor.cs
@@ -176,6 +176,7 @@ internal class RichTextPropertyValueEditor : BlockValuePropertyValueEditorBase
         private readonly IJsonSerializer _jsonSerializer;
         private readonly IBlockEditorElementTypeCache _elementTypeCache;
         private readonly IRichTextRequiredValidator _richTextRequiredValidator;
+        private readonly IRichTextRegexValidator _richTextRegexValidator;
         private readonly ILogger<RichTextPropertyValueEditor> _logger;
 
         [Obsolete("Use non-obsolete constructor. This is schedules for removal in v16.")]
@@ -215,10 +216,11 @@ public RichTextPropertyValueEditor(
                 elementTypeCache,
                 propertyValidationService,
                 dataValueReferenceFactoryCollection,
-                StaticServiceProvider.Instance.GetRequiredService<IRichTextRequiredValidator>())
+                StaticServiceProvider.Instance.GetRequiredService<IRichTextRequiredValidator>(),
+                StaticServiceProvider.Instance.GetRequiredService<IRichTextRegexValidator>())
         {
-
         }
+
         public RichTextPropertyValueEditor(
             DataEditorAttribute attribute,
             PropertyEditorCollection propertyEditors,
@@ -238,6 +240,49 @@ public RichTextPropertyValueEditor(
             IPropertyValidationService propertyValidationService,
             DataValueReferenceFactoryCollection dataValueReferenceFactoryCollection,
             IRichTextRequiredValidator richTextRequiredValidator)
+            : this(
+                attribute,
+                propertyEditors,
+                dataTypeReadCache,
+                logger,
+                backOfficeSecurityAccessor,
+                localizedTextService,
+                shortStringHelper,
+                imageSourceParser,
+                localLinkParser,
+                pastedImages,
+                jsonSerializer,
+                ioHelper,
+                htmlSanitizer,
+                macroParameterParser,
+                elementTypeCache,
+                propertyValidationService,
+                dataValueReferenceFactoryCollection,
+                richTextRequiredValidator,
+                StaticServiceProvider.Instance.GetRequiredService<IRichTextRegexValidator>())
+            {
+            }
+
+        public RichTextPropertyValueEditor(
+            DataEditorAttribute attribute,
+            PropertyEditorCollection propertyEditors,
+            IDataTypeConfigurationCache dataTypeReadCache,
+            ILogger<RichTextPropertyValueEditor> logger,
+            IBackOfficeSecurityAccessor backOfficeSecurityAccessor,
+            ILocalizedTextService localizedTextService,
+            IShortStringHelper shortStringHelper,
+            HtmlImageSourceParser imageSourceParser,
+            HtmlLocalLinkParser localLinkParser,
+            RichTextEditorPastedImages pastedImages,
+            IJsonSerializer jsonSerializer,
+            IIOHelper ioHelper,
+            IHtmlSanitizer htmlSanitizer,
+            IHtmlMacroParameterParser macroParameterParser,
+            IBlockEditorElementTypeCache elementTypeCache,
+            IPropertyValidationService propertyValidationService,
+            DataValueReferenceFactoryCollection dataValueReferenceFactoryCollection,
+            IRichTextRequiredValidator richTextRequiredValidator,
+            IRichTextRegexValidator richTextRegexValidator)
             : base(attribute, propertyEditors, dataTypeReadCache, localizedTextService, logger, shortStringHelper, jsonSerializer, ioHelper, dataValueReferenceFactoryCollection)
         {
             _backOfficeSecurityAccessor = backOfficeSecurityAccessor;
@@ -249,6 +294,7 @@ public RichTextPropertyValueEditor(
             _macroParameterParser = macroParameterParser;
             _elementTypeCache = elementTypeCache;
             _richTextRequiredValidator = richTextRequiredValidator;
+            _richTextRegexValidator = richTextRegexValidator;
             _jsonSerializer = jsonSerializer;
             _logger = logger;
 
@@ -257,6 +303,8 @@ public RichTextPropertyValueEditor(
 
         public override IValueRequiredValidator RequiredValidator => _richTextRequiredValidator;
 
+        public override IValueFormatValidator FormatValidator => _richTextRegexValidator;
+
         /// <inheritdoc />
         public override object? Configuration
         {
diff --git a/src/Umbraco.Infrastructure/PropertyEditors/Validators/IRichTextRegexValidator.cs b/src/Umbraco.Infrastructure/PropertyEditors/Validators/IRichTextRegexValidator.cs
new file mode 100644
index 000000000000..8b6955432215
--- /dev/null
+++ b/src/Umbraco.Infrastructure/PropertyEditors/Validators/IRichTextRegexValidator.cs
@@ -0,0 +1,5 @@
+namespace Umbraco.Cms.Core.PropertyEditors.Validators;
+
+internal interface IRichTextRegexValidator : IValueFormatValidator
+{
+}
diff --git a/src/Umbraco.Infrastructure/PropertyEditors/Validators/RichTextRegexValidator.cs b/src/Umbraco.Infrastructure/PropertyEditors/Validators/RichTextRegexValidator.cs
new file mode 100644
index 000000000000..aefbe3a5deaa
--- /dev/null
+++ b/src/Umbraco.Infrastructure/PropertyEditors/Validators/RichTextRegexValidator.cs
@@ -0,0 +1,30 @@
+using System.ComponentModel.DataAnnotations;
+using Microsoft.Extensions.Logging;
+using Umbraco.Cms.Core.Serialization;
+using Umbraco.Cms.Core.Services;
+
+namespace Umbraco.Cms.Core.PropertyEditors.Validators;
+
+internal class RichTextRegexValidator : IRichTextRegexValidator
+{
+    private readonly RegexValidator _regexValidator;
+    private readonly IJsonSerializer _jsonSerializer;
+    private readonly ILogger<RichTextRegexValidator> _logger;
+
+    public RichTextRegexValidator(
+        IJsonSerializer jsonSerializer,
+        ILogger<RichTextRegexValidator> logger,
+        RegexValidator regexValidator)
+    {
+        _jsonSerializer = jsonSerializer;
+        _logger = logger;
+        _regexValidator = regexValidator;
+    }
+
+    public IEnumerable<ValidationResult> ValidateFormat(object? value, string? valueType, string format) => _regexValidator.ValidateFormat(GetValue(value), valueType, format);
+
+    private object? GetValue(object? value) =>
+        RichTextPropertyEditorHelper.TryParseRichTextEditorValue(value, _jsonSerializer, _logger, out RichTextEditorValue? richTextEditorValue)
+            ? richTextEditorValue?.Markup
+            : value;
+}