[sitecore-jss-nextjs]: fixed redirects middleware when pattern use default locale in regexp (#1696)

Author: art-alexeyenko

CHANGELOG.md

@@ -9,6 +9,12 @@ Our versioning strategy is as follows:
 - Minor: may include breaking changes in framework packages (e.g. framework upgrades, new features, improvements)
 - Major: may include breaking changes in core packages (e.g. major architectural changes, major features)
 
+## Unreleased
+
+### 🐛 Bug Fixes
+
+* `[sitecore-jss-nextjs]` Fix loop error in redirect middleware when the pattern of redirect has default locale. ([#1696](https://github.com/Sitecore/jss/pull/1696))
+
 ## 21.5.2
 
 ### 🎉 New Features & Improvements

packages/sitecore-jss-nextjs/src/middleware/redirects-middleware.ts

@@ -169,9 +169,12 @@ export class RedirectsMiddleware extends MiddlewareBase {
     const redirects = await this.redirectsService.fetchRedirects(siteName);
     const tragetURL = req.nextUrl.pathname;
     const targetQS = req.nextUrl.search || '';
+    const language = this.getLanguage(req);
+    const modifyRedirects = structuredClone(redirects);
 
-    return redirects.length
-      ? redirects.find((redirect: RedirectInfo) => {
+    return modifyRedirects.length
+      ? modifyRedirects.find((redirect: RedirectInfo) => {
+          redirect.pattern = redirect.pattern.replace(RegExp(`^[^]?/${language}/`, 'gi'), '');
           redirect.pattern = `/^\/${redirect.pattern
             .replace(/^\/|\/$/g, '')
             .replace(/^\^\/|\/\$$/g, '')