diff --git a/src/node/markdown/plugins/highlight.ts b/src/node/markdown/plugins/highlight.ts
index c21524384e0..186d9bc9344 100644
--- a/src/node/markdown/plugins/highlight.ts
+++ b/src/node/markdown/plugins/highlight.ts
@@ -20,7 +20,7 @@ import type { ThemeOptions } from '../markdown'
  *    [{ line: number, classes: string[] }]
  */
 const attrsToLines = (attrs: string): HtmlRendererOptions['lineOptions'] => {
-  attrs = attrs.replace(/.*?([\d,-]+).*/, '$1').trim()
+  attrs = attrs.replace(/^(?:\[.*?\])?.*?([\d,-]+).*/, '$1').trim()
   const result: number[] = []
   if (!attrs) {
     return []