diff --git a/packages/next/src/server/lib/router-utils/filesystem.ts b/packages/next/src/server/lib/router-utils/filesystem.ts
index d442b87fff85..270580f1f81a 100644
--- a/packages/next/src/server/lib/router-utils/filesystem.ts
+++ b/packages/next/src/server/lib/router-utils/filesystem.ts
@@ -249,7 +249,7 @@ export async function setupFsCheck(opts: {
               ? new RegExp(
                   route.dataRouteRegex.replace(
                     `/${escapedBuildId}/`,
-                    `/${escapedBuildId}/(?<nextLocale>.+?)/`
+                    `/${escapedBuildId}/(?<nextLocale>[^/]+?)/`
                   )
                 )
               : new RegExp(route.dataRouteRegex),
diff --git a/packages/next/src/server/lib/router-utils/setup-dev.ts b/packages/next/src/server/lib/router-utils/setup-dev.ts
index 2faaf385fa39..cf17fb2d7d9e 100644
--- a/packages/next/src/server/lib/router-utils/setup-dev.ts
+++ b/packages/next/src/server/lib/router-utils/setup-dev.ts
@@ -1784,7 +1784,7 @@ async function startWatcher(opts: SetupOpts) {
                 ? new RegExp(
                     route.dataRouteRegex.replace(
                       `/development/`,
-                      `/development/(?<nextLocale>.+?)/`
+                      `/development/(?<nextLocale>[^/]+?)/`
                     )
                   )
                 : new RegExp(route.dataRouteRegex),