diff --git a/lib/api/decorators/property_schema_representer.rb b/lib/api/decorators/property_schema_representer.rb
index c4aafe9706..56ae787b88 100644
--- a/lib/api/decorators/property_schema_representer.rb
+++ b/lib/api/decorators/property_schema_representer.rb
@@ -47,7 +47,8 @@ module API
                     :required,
                     :writable,
                     :min_length,
-                    :max_length
+                    :max_length,
+                    :regular_expression
 
       property :type, exec_context: :decorator
       property :name, exec_context: :decorator
@@ -55,6 +56,7 @@ module API
       property :writable, exec_context: :decorator
       property :min_length, exec_context: :decorator
       property :max_length, exec_context: :decorator
+      property :regular_expression, exec_context: :decorator
     end
   end
 end
diff --git a/lib/api/decorators/schema.rb b/lib/api/decorators/schema.rb
index 8dfde046f0..d11b3ea33c 100644
--- a/lib/api/decorators/schema.rb
+++ b/lib/api/decorators/schema.rb
@@ -37,15 +37,17 @@ module API
                    required: true,
                    writable: true,
                    min_length: nil,
-                   max_length: nil)
+                   max_length: nil,
+                   regular_expression: nil)
           raise ArgumentError if property.nil?
 
           schema = ::API::Decorators::PropertySchemaRepresenter.new(type: type,
                                                                     name: title,
                                                                     required: required,
                                                                     writable: writable)
-          schema.min_length = min_length if min_length
-          schema.max_length = max_length if max_length
+          schema.min_length = min_length
+          schema.max_length = max_length
+          schema.regular_expression = regular_expression
 
           property property,
                    getter: -> (*) { schema },
diff --git a/lib/api/v3/utilities/custom_field_injector.rb b/lib/api/v3/utilities/custom_field_injector.rb
index b54bb368b8..0345890446 100644
--- a/lib/api/v3/utilities/custom_field_injector.rb
+++ b/lib/api/v3/utilities/custom_field_injector.rb
@@ -221,7 +221,10 @@ module API
                         type: TYPE_MAP[custom_field.field_format],
                         title: custom_field.name,
                         required: custom_field.is_required,
-                        writable: true
+                        writable: true,
+                        min_length: (custom_field.min_length if custom_field.min_length > 0),
+                        max_length: (custom_field.max_length if custom_field.max_length > 0),
+                        regular_expression: (custom_field.regexp unless custom_field.regexp.blank?)
         end
 
         def path_method_for(custom_field)
diff --git a/spec/lib/api/v3/utilities/custom_field_injector_spec.rb b/spec/lib/api/v3/utilities/custom_field_injector_spec.rb
index 9ebd92dd7c..08a06b6d44 100644
--- a/spec/lib/api/v3/utilities/custom_field_injector_spec.rb
+++ b/spec/lib/api/v3/utilities/custom_field_injector_spec.rb
@@ -69,13 +69,49 @@ describe ::API::V3::Utilities::CustomFieldInjector do
         let(:writable) { true }
       end
 
-      context 'when the custom field is not required' do
+      it 'indicates no regular expression' do
+        is_expected.to_not have_json_path("#{cf_path}/regularExpression")
+      end
+
+      it 'indicates no minimum size' do
+        is_expected.to_not have_json_path("#{cf_path}/minLength")
+      end
+
+      it 'indicates no maximum size' do
+        is_expected.to_not have_json_path("#{cf_path}/maxLength")
+      end
+
+      context 'custom field is not required' do
         let(:custom_field) { FactoryGirl.build(:custom_field, is_required: false) }
 
         it 'marks the field as not required' do
           is_expected.to be_json_eql(false.to_json).at_path("#{cf_path}/required")
         end
       end
+
+      context 'custom field has regex' do
+        let(:custom_field) { FactoryGirl.build(:custom_field, regexp: 'Foo+bar') }
+
+        it 'renders the regular expression' do
+          is_expected.to be_json_eql('Foo+bar'.to_json).at_path("#{cf_path}/regularExpression")
+        end
+      end
+
+      context 'custom field has minimum length' do
+        let(:custom_field) { FactoryGirl.build(:custom_field, min_length: 5) }
+
+        it 'renders the minimum length' do
+          is_expected.to be_json_eql(5.to_json).at_path("#{cf_path}/minLength")
+        end
+      end
+
+      context 'custom field has maximum length' do
+        let(:custom_field) { FactoryGirl.build(:custom_field, max_length: 5) }
+
+        it 'renders the maximum length' do
+          is_expected.to be_json_eql(5.to_json).at_path("#{cf_path}/maxLength")
+        end
+      end
     end
 
     describe 'version custom field' do