diff --git a/src/editor/schema.ts b/src/editor/schema.ts
index 9568d1f..06e25ea 100644
--- a/src/editor/schema.ts
+++ b/src/editor/schema.ts
@@ -314,7 +314,7 @@ export const schema = new Schema({
             const href = dom.getAttribute("href");
             if (
               href &&
-              /[useandom\-26T198340PX75pxJACKVERYMINDBUSHWOLF_GQZbfghjklqvwyzrict]{21}/.test(
+              /^[useandom\-26T198340PX75pxJACKVERYMINDBUSHWOLF_GQZbfghjklqvwyzrict]{21}$/.test(
                 href,
               )
             ) {