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Invalid Custom Route `source`

Why This Error Occurred​

A pattern could not be parsed when defining custom routes or a middleware matcher.

This could have been due to trying to use normal RegExp syntax like negative lookaheads (?!exclude) without following path-to-regexp's syntax.

Possible Ways to Fix It​

Wrap the RegExp part of your source as an un-named parameter.

Custom Routes​

Before

{
  source: '/feedback/(?!general)',
  destination: '/feedback/general'
}

After

{
  source: '/feedback/((?!general).*)',
  destination: '/feedback/general'
}
Middleware​

Before

const config = {
  matcher: '/feedback/(?!general)',
}

After

const config = {
  matcher: '/feedback/((?!general).*)',
}