diff --git a/app/validators/types_de_champ/expression_reguliere_validator.rb b/app/validators/types_de_champ/expression_reguliere_validator.rb
index 39262adeb..3aaef80e7 100644
--- a/app/validators/types_de_champ/expression_reguliere_validator.rb
+++ b/app/validators/types_de_champ/expression_reguliere_validator.rb
@@ -4,7 +4,11 @@ class TypesDeChamp::ExpressionReguliereValidator < ActiveModel::EachValidator
       .flat_map { _1.repetition? ? procedure.draft_revision.children_of(_1) : _1 }
       .each do |tdc|
       if tdc.expression_reguliere? && tdc.invalid_regexp?
-        procedure.errors.add(:expression_reguliere, type_de_champ: tdc)
+        procedure.errors.add(
+          attribute,
+          procedure.errors.generate_message(attribute, :expression_reguliere_invalid, { value: tdc.libelle }),
+          type_de_champ: tdc
+        )
       end
     end
   end
diff --git a/config/locales/models/procedure/en.yml b/config/locales/models/procedure/en.yml
index 34fc89e35..1328196b5 100644
--- a/config/locales/models/procedure/en.yml
+++ b/config/locales/models/procedure/en.yml
@@ -76,12 +76,14 @@ en:
               empty_repetition: 'requires at least one field'
               empty_drop_down: 'requires at least one option'
               inconsistent_header_section: "%{custom_message}"
+              expression_reguliere_invalid: "is invalid"
             draft_types_de_champ_private:
               format: 'Private field %{message}'
               invalid_condition: "have an invalid logic"
               empty_repetition: 'requires at least one field'
               empty_drop_down: 'requires at least one option'
               inconsistent_header_section: "%{custom_message}"
+              expression_reguliere_invalid: "is invalid"
             attestation_template:
               format: "%{attribute} %{message}"
             initiated_mail:
diff --git a/config/locales/models/procedure/fr.yml b/config/locales/models/procedure/fr.yml
index 5a9dfd9ab..35713d133 100644
--- a/config/locales/models/procedure/fr.yml
+++ b/config/locales/models/procedure/fr.yml
@@ -82,12 +82,14 @@ fr:
               empty_repetition: 'doit comporter au moins un champ répétable'
               empty_drop_down: 'doit comporter au moins un choix sélectionnable'
               inconsistent_header_section: "%{custom_message}"
+              expression_reguliere_invalid: "est invalide, veuillez la corriger"
             draft_types_de_champ_private:
               format: 'L’annotation privée %{message}'
               invalid_condition: "a une logique conditionnelle invalide"
               empty_repetition: 'doit comporter au moins un champ répétable'
               empty_drop_down: 'doit comporter au moins un choix sélectionnable'
               inconsistent_header_section: "%{custom_message}"
+              expression_reguliere_invalid: "est invalide, veuillez la corriger"
             attestation_template:
               format: "%{attribute} %{message}"
             initiated_mail:
diff --git a/spec/components/procedures/errors_summary_spec.rb b/spec/components/procedures/errors_summary_spec.rb
index ebeb1096d..06bf2c145 100644
--- a/spec/components/procedures/errors_summary_spec.rb
+++ b/spec/components/procedures/errors_summary_spec.rb
@@ -50,7 +50,8 @@ describe Procedure::ErrorsSummary, type: :component do
         { libelle: 'repetition requires children', type: :repetition, children: [] },
         { libelle: 'drop down list requires options', type: :drop_down_list, options: [] },
         { libelle: 'invalid condition', type: :text, condition: ds_eq(constant(true), constant(1)) },
-        { libelle: 'header sections must have consistent order', type: :header_section, level: 2 }
+        { libelle: 'header sections must have consistent order', type: :header_section, level: 2 },
+        { libelle: 'regexp invalid', type: :expression_reguliere, expression_reguliere_exemple_text: 'kthxbye', expression_reguliere: /{/ }
       ])
     end
 
@@ -70,6 +71,9 @@ describe Procedure::ErrorsSummary, type: :component do
 
       expect(page).to have_selector("a", text: "header sections must have consistent order")
       expect(page).to have_content("devrait être précédé d'un titre de niveau 1")
+
+      expect(page).to have_selector("a", text: "regexp invalid")
+      expect(page).to have_content("est invalide, veuillez la corriger")
     end
   end