diff --git a/packages/extension-underline/index.ts b/packages/extension-underline/index.ts
index 5943c2b6..abb950fa 100644
--- a/packages/extension-underline/index.ts
+++ b/packages/extension-underline/index.ts
@@ -6,9 +6,6 @@ declare module '@tiptap/core/src/Editor' {
   }
 }
 
-export const inputRegex = /(?:^|\s)((?:~)((?:[^~]+))(?:~))$/gm
-export const pasteRegex = /(?:^|\s)((?:~)((?:[^~]+))(?:~))/gm
-
 export default new Mark()
   .name('underline')
   .schema(() => ({