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[go_router] path parameters regex can't use grouping #117307
Description
Steps to Reproduce
Declare a GoRoute with a path like this:
/details/:id((FOO|BAR)[0-9a-zA-Z]{10})
Expected results:
The following values for id should both match:
FOO1234567890
BAR1234567890
Actual results:
The route path doesn't match, and the app goes to the "Page not found" route.
Code sample
import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
void main() => runApp(const MyApp());
/// The route configuration.
final GoRouter _router = GoRouter(
debugLogDiagnostics: true,
routes: <RouteBase>[
GoRoute(
path: '/',
builder: (_, __) => const HomeScreen(),
),
GoRoute(
path: '/details/:id((FOO|BAR)[0-9a-zA-Z]{10})',
builder: (_, state) => DetailsScreen(state.params["id"]!),
),
],
);
/// The main app.
class MyApp extends StatelessWidget {
/// Constructs a [MyApp]
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp.router(
routerConfig: _router,
);
}
}
/// The home screen
class HomeScreen extends StatelessWidget {
/// Constructs a [HomeScreen]
const HomeScreen({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: const Text('Home Screen')),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
ElevatedButton(
onPressed: () => context.push('/details/FOO1234567890'),
child: const Text('FOO1234567890'),
),
ElevatedButton(
onPressed: () => context.push('/details/BAR1234567890'),
child: const Text('BAR1234567890'),
),
],
),
),
);
}
}
/// The details screen
class DetailsScreen extends StatelessWidget {
final String id;
/// Constructs a [DetailsScreen]
const DetailsScreen(this.id, {super.key});
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: const Text('Details Screen')),
body: Center(
child: Text("Id is:\n $id"),
),
);
}
}
Logs
[GoRouter] Full paths for routes:
=> /
=> /details/:id((FOO|BAR)[0-9a-zA-Z]{10})
[GoRouter] setting initial location null
[GoRouter] Using MaterialApp configuration
[GoRouter] pushing /details/FOO1234567890
[GoRouter] No initial matches: /details/FOO1234567890
[GoRouter] going to /
[GoRouter] pushing /details/BAR1234567890
[GoRouter] No initial matches: /details/BAR1234567890
flutter analyze
Analyzing bug...
No issues found! (ran in 1.2s)
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.3.9, on macOS 13.0 22A380 darwin-arm, locale it-IT)
[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 14.1)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2021.3)
[✓] VS Code (version 1.74.0)
[✓] Connected device (3 available)
[✓] HTTP Host Availability
• No issues found!
Reacted by Yukiteru Attano
Activity
exaby73 commentedon Dec 19, 2022
Triage report
I can reproduce this issue with
go_router: 5.2.4. Experimenting with different ways of writing the regex with groups, doesn't work. Removing the group with something like[a-zA-Z0-9]{13}works.Code Sample (Same as OP)
MaximeRougieux commentedon Aug 24, 2026
In addition to what you are mentioning, it seems the Regexp parsing cannot handle any internal parenthesis, so it excludes patterns like
/details/:id((?!FOO|BAR)[0-9a-zA-Z]{10})which should match BAZ0123456789 but not FOO0123456789, instead the pattern is read literallyI have opened a PR to fix these issues: flutter/packages#12571
[go_router] Support nested parentheses, groups, and lookaround assert…
github-actions commentedon Nov 13, 2026
This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of
flutter doctor -vand a minimal reproduction of the issue.