diff --git a/app/models/govuk_publishing_components/audit_applications.rb b/app/models/govuk_publishing_components/audit_applications.rb
index d7603aeafc..d73b5fb4f9 100644
--- a/app/models/govuk_publishing_components/audit_applications.rb
+++ b/app/models/govuk_publishing_components/audit_applications.rb
@@ -161,7 +161,7 @@ def find_code_references(file, src, regex)
     end
 
     def clean_file_path(file)
-      file[/(?<=#{Regexp.escape(@path.to_s)}\/)[\/a-zA-Z_-]+.[a-zA-Z+.]+/]
+      file[/(?<=#{Regexp.escape(@path.to_s)}\/)[\/0-9a-zA-Z_-]+.[0-9a-zA-Z+.]+/]
     end
 
     def clean_file_name(name)
diff --git a/spec/component_guide/audit_applications_spec.rb b/spec/component_guide/audit_applications_spec.rb
index d0e40abf38..84cbd66f6f 100644
--- a/spec/component_guide/audit_applications_spec.rb
+++ b/spec/component_guide/audit_applications_spec.rb
@@ -45,7 +45,7 @@
         "error summary": ["app/views/welcome/error_summary.html.erb"],
         details: ["app/views/welcome/asset_helper.html.erb"],
         feedback: ["app/views/layouts/application.html.erb"],
-        govspeak: ["app/views/welcome/contextual_navigation.html.erb", "lib/test_file_1.rb"],
+        govspeak: ["app/views/welcome/contextual_navigation.html.erb", "lib/1_test_file_1.rb"],
         input: ["app/views/welcome/error_summary.html.erb", "app/views/welcome/error_summary.html.erb"],
         "layout footer": ["app/views/layouts/dummy_admin_layout.html.erb"],
         "layout for admin": ["app/views/layouts/dummy_admin_layout.html.erb"],
diff --git a/spec/dummy/lib/test_file_1.rb b/spec/dummy/lib/1_test_file_1.rb
similarity index 100%
rename from spec/dummy/lib/test_file_1.rb
rename to spec/dummy/lib/1_test_file_1.rb