From 7ab63516bd1cd480932c82e85ab40d43446fbaae Mon Sep 17 00:00:00 2001
From: Peter White <1788320+peterwhite@users.noreply.github.com>
Date: Thu, 12 Mar 2026 11:06:33 +0100
Subject: [PATCH] Import site redirect patterns from @gitbook/api (#4107)

---
 .changeset/metal-pugs-bake.md                     |  5 +++++
 packages/gitbook/src/components/SitePage/fetch.ts | 13 ++++++++-----
 2 files changed, 13 insertions(+), 5 deletions(-)
 create mode 100644 .changeset/metal-pugs-bake.md

diff --git a/.changeset/metal-pugs-bake.md b/.changeset/metal-pugs-bake.md
new file mode 100644
index 000000000..8533c4fe5
--- /dev/null
+++ b/.changeset/metal-pugs-bake.md
@@ -0,0 +1,5 @@
+---
+"gitbook": patch
+---
+
+Import site redirect patterns from @gitbook/api
diff --git a/packages/gitbook/src/components/SitePage/fetch.ts b/packages/gitbook/src/components/SitePage/fetch.ts
index 359ade537..b955d45ac 100644
--- a/packages/gitbook/src/components/SitePage/fetch.ts
+++ b/packages/gitbook/src/components/SitePage/fetch.ts
@@ -1,6 +1,11 @@
 import type { GitBookSiteContext } from '@/lib/context';
 import { redirect } from 'next/navigation';
 
+import {
+    SITE_REDIRECT_SOURCE_PATH_MAX_LENGTH,
+    SITE_REDIRECT_SOURCE_PATH_PATTERN,
+} from '@gitbook/api';
+
 import { getDataOrNull } from '@/lib/data';
 import { resolvePageId, resolvePagePath } from '@/lib/pages';
 import { withLeadingSlash } from '@/lib/paths';
@@ -53,10 +58,8 @@ async function resolvePage(context: GitBookSiteContext, params: PagePathParams |
 
     // We don't test path that are too long as GitBook doesn't support them and will return a 404 anyway.
     // API has a limit of less than 512 characters for the source path, so we use the same limit here.
-    if (rawPathname.length < 512) {
-        // Duplicated the regex pattern from SiteRedirectSourcePath API type.
-        const SITE_REDIRECT_SOURCE_PATH_REGEX =
-            /^\/(?!\*)(?!.*\*.+)(?:[A-Za-z0-9\-._~]|%[0-9A-Fa-f]{2})+(?:\/(?:[A-Za-z0-9\-._~]|%[0-9A-Fa-f]{2})+)*(?:\/\*|\*)?$/;
+    if (rawPathname.length < SITE_REDIRECT_SOURCE_PATH_MAX_LENGTH) {
+        const SITE_REDIRECT_SOURCE_PATH_REGEX = new RegExp(SITE_REDIRECT_SOURCE_PATH_PATTERN);
         const redirectPathname = withLeadingSlash(rawPathname);
         // If a page can't be found, we try with the API, in case we have a redirect at site level.
         const redirectSources = new Set(
@@ -75,7 +78,7 @@ async function resolvePage(context: GitBookSiteContext, params: PagePathParams |
         for (const source of redirectSources) {
             // We try to resolve the site redirect
             const resolvedSiteRedirect =
-                source.length < 512 &&
+                source.length < SITE_REDIRECT_SOURCE_PATH_MAX_LENGTH &&
                 (await getDataOrNull(
                     context.dataFetcher.getSiteRedirectBySource({
                         organizationId,