diff --git a/packages/extension-highlight/src/highlight.ts b/packages/extension-highlight/src/highlight.ts
index 3d3b8af7..71642cce 100644
--- a/packages/extension-highlight/src/highlight.ts
+++ b/packages/extension-highlight/src/highlight.ts
@@ -29,8 +29,8 @@ declare module '@tiptap/core' {
   }
 }
 
-export const inputRegex = /(?:^|\s)((?:==)((?:[^~]+))(?:==))$/
-export const pasteRegex = /(?:^|\s)((?:==)((?:[^~]+))(?:==))/g
+export const inputRegex = /(?:^|\s)((?:==)((?:[^~=]+))(?:==))$/
+export const pasteRegex = /(?:^|\s)((?:==)((?:[^~=]+))(?:==))/g
 
 export const Highlight = Mark.create<HighlightOptions>({
   name: 'highlight',