Route and index token regex not working with "+" symbol at start

[RobertOstermann]

Which project does this relate to?

Router

Describe the bug

The routeToken and indexToken configuration values for TanStack Router are not working as expected. Routes beginning with a "+" symbol are not working as index or layout routes.

Your Example Website or App

https://stackblitz.com/edit/tanstack-router-o6v4qzgj?file=vite.config.js

Steps to Reproduce the Bug or Issue

1. Setup TanStack Router with a file-based routing setup
2. Update the routeToken and indexToken configuration values to routeToken: '+layout' and indexToken: '+page'
3. Create an index route, +page.tsx, which should correctly have the route set.
4. Create a folder and create and index route within that folder, folder/+page.tsx, the route is not set correctly.

Expected behavior

I expect the index and route tokens to allow setting regexes which accept values such as + at the beginning of the token. This should work for both the base index route as well as routes within folders.

Screenshots or Videos

No response

Platform

• Router / Start Version: ^1.168.3
• OS: macOs
• Browser: Chrome
• Browser Version:
• Bundler: Vite
• Bundler Version: 7.0.0

Additional context

No response

[RobertOstermann]

Also worth noting this was working for me previously with TanStack Router version 1.139.7.