nextjs config_error ai_generated true

Error: Invalid middleware matcher. The pattern 'X' is not a valid regex or path pattern.

ID: nextjs/invalid-middleware-matcher-regex

Also available as: JSON · Markdown · 中文

95%Fix Rate

90%Confidence

1Evidence

2023-09-05First Seen

Version Compatibility

Version	Status	Introduced	Deprecated	Notes
[email protected]	active	—	—	—
[email protected]	active	—	—	—
[email protected]	active	—	—	—

Root Cause

The matcher array in middleware.config contains a malformed regex or path pattern that Next.js cannot parse.

generic

中文

middleware.config 中的匹配器数组包含一个格式错误的正则表达式或路径模式，Next.js 无法解析。

Official Documentation

https://nextjs.org/docs/app/building-your-application/routing/middleware#matcher

Workarounds

95% success Use the correct glob syntax for path matching. For example, to match all API routes: export const config = { matcher: '/api/:path*', }; For multiple patterns, use an array: export const config = { matcher: ['/api/:path*', '/admin/:path*'], };
```
Use the correct glob syntax for path matching. For example, to match all API routes:

export const config = {
  matcher: '/api/:path*',
};

For multiple patterns, use an array:
export const config = {
  matcher: ['/api/:path*', '/admin/:path*'],
};
```
85% success If you need complex matching, use a custom middleware function that checks the request URL manually instead of relying on matcher.
```
If you need complex matching, use a custom middleware function that checks the request URL manually instead of relying on matcher.
```
90% success Validate your pattern using the Next.js documentation: patterns use a simplified glob where '*' matches any path segment and ':param' captures named parameters.
```
Validate your pattern using the Next.js documentation: patterns use a simplified glob where '*' matches any path segment and ':param' captures named parameters.
```

中文步骤

使用正确的 glob 语法进行路径匹配。例如，匹配所有 API 路由：

export const config = {
  matcher: '/api/:path*',
};

对于多个模式，使用数组：
export const config = {
  matcher: ['/api/:path*', '/admin/:path*'],
};

如果需要复杂匹配，使用自定义中间件函数手动检查请求 URL，而不是依赖匹配器。

使用 Next.js 文档验证你的模式：模式使用简化的 glob，其中 '*' 匹配任何路径段，':param' 捕获命名参数。

Dead Ends

Common approaches that don't work:

80% fail
Next.js matcher patterns use a simplified glob syntax, not full regex. Forward slashes are reserved for path segments.
70% fail
Characters like '.' or '*' need escaping in regex but Next.js matcher uses glob where '*' is a wildcard, causing ambiguity.
50% fail
An empty array matches no routes, effectively disabling the middleware, which may not be the intended behavior.