diff --git a/src/client/theme-default/composables/repo.ts b/src/client/theme-default/composables/repo.ts
index fa6c6ab8..5bb2112b 100644
--- a/src/client/theme-default/composables/repo.ts
+++ b/src/client/theme-default/composables/repo.ts
@@ -1,6 +1,7 @@
 import { computed } from 'vue'
 import { useData } from 'vitepress'
 import type { DefaultTheme } from '../config'
+import { EXTERNAL_URL_RE } from '../../shared'
 
 export const platforms = ['GitHub', 'GitLab', 'Bitbucket'].map((platform) => {
   return [platform, new RegExp(platform, 'i')] as const
@@ -26,7 +27,7 @@ export function useRepo() {
 
 function getRepoUrl(repo: string): string {
   // if the full url is not provided, default to GitHub repo
-  return /^https?:/.test(repo) ? repo : `https://github.com/${repo}`
+  return EXTERNAL_URL_RE.test(repo) ? repo : `https://github.com/${repo}`
 }
 
 function getRepoText(url: string, text?: string): string {
diff --git a/src/node/markdown/plugins/link.ts b/src/node/markdown/plugins/link.ts
index 1e0bcbbb..7664f10a 100644
--- a/src/node/markdown/plugins/link.ts
+++ b/src/node/markdown/plugins/link.ts
@@ -5,6 +5,7 @@
 import MarkdownIt from 'markdown-it'
 import { MarkdownParsedData } from '../markdown'
 import { URL } from 'url'
+import { EXTERNAL_URL_RE } from '../../shared'
 
 const indexRE = /(^|.*\/)index.md(#?.*)$/i
 
@@ -18,7 +19,7 @@ export const linkPlugin = (
     if (hrefIndex >= 0) {
       const hrefAttr = token.attrs![hrefIndex]
       const url = hrefAttr[1]
-      const isExternal = /^https?:/.test(url)
+      const isExternal = EXTERNAL_URL_RE.test(url)
       if (isExternal) {
         Object.entries(externalAttrs).forEach(([key, val]) => {
           token.attrSet(key, val)