diff --git a/packages/docusaurus-theme-classic/src/theme/CodeBlock/index.tsx b/packages/docusaurus-theme-classic/src/theme/CodeBlock/index.tsx
index 5a61badac7ca..24087ff4119e 100644
--- a/packages/docusaurus-theme-classic/src/theme/CodeBlock/index.tsx
+++ b/packages/docusaurus-theme-classic/src/theme/CodeBlock/index.tsx
@@ -84,7 +84,7 @@ const highlightDirectiveRegex = (lang) => {
       return getHighlightDirectiveRegex();
   }
 };
-const codeBlockTitleRegex = /title=".*"/;
+const codeBlockTitleRegex = /(?<=title=").*(?=")/;
 
 export default ({
   children,
@@ -125,9 +125,7 @@ export default ({
     // Tested above
     // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
     codeBlockTitle = metastring
-      .match(codeBlockTitleRegex)![0]
-      .split('title=')[1]
-      .replace(/"+/g, '');
+      .match(codeBlockTitleRegex)![0];
   }
 
   let language =