Is there an existing issue for this?

• I have checked for existing issues https://github.com/getsentry/sentry-javascript/issues
• I have reviewed the documentation https://docs.sentry.io/
• I am using the latest SDK release https://github.com/getsentry/sentry-javascript/releases

How do you use Sentry?

Sentry Saas (sentry.io)

Which SDK are you using?

@sentry/nextjs

SDK Version

10.2.0

Framework Version

Next 14.2.23

Link to Sentry event

No response

Reproduction Example/SDK Setup

next.config.js

const nextConfig = {
 // other options
 basePath: '/shop'
}

instrumentation-client.ts

import * as Sentry from "@sentry/nextjs";
Sentry.init({
 dsn: SENTRY_DSN
 integrations: [],
 // other options
})

sentry app dir path

• use next-intl
• use basePath /shop

./[locale]
./[locale]/[...others]
./[locale]/product/[id]

Steps to Reproduce

1. request /shop/ko/product/23kjkfdf url page
2. sentry send pageload transaction with :locale/:others*

Expected Result

sentry send pageload transaction with shop/:locale/product/:id or :locale/product/:id

Actual Result

sentry send pageload transaction with :locale/:others*

Additional Context

_{Tip: React with 👍 to help prioritize this issue. Please use comments to provide useful context, avoiding +1 or me too, to help us triage it.}

I use next.js app with basePath config option activated with `/shop``

However, when using Sentry, transactions are always parameterized as :locale/:others*.
Because of this, I cannot group transactions correctly (e.g. /shop/ko/product/s192389 should map to :locale/product/:id, or shop/:locale/product/:id but it ends up as /:locale/:others*).

It seems that createRouteManifest generates regexes without considering basePath.