Do not match certain words as parameters with path-to-regexp

[Milutin-P]

I have a route /:parameter and if someone pings that route I should serve him certain page (React App)
So what I need is some kind of regexp that wont match certain words...

Regular expression should be ^(?!.*(foobar1|\/foobar2)).*$

https://pshrmn.github.io/route-tester/#/ I've used this tool for testing and entered various combinations, such as /parameter(?!.*(foobar1|\/foobar2)) but no luck...

So test case should be

if path is /foobar3 it should return page
if path is /foobar2 or /foobar3 it should return null

[tigt]

Does “the best regex trick” work for your needs? I think it would express your example as /(?:foobar2|foobar3|(foobar1))/, but I admit I couldn’t figure out how to translate it into a form that the linked route-tester page was happy with.

[juanmagalhaes]

+1 here. I'm facing the same issue right now.

[blakeembrey]

If someone wants to propose expanding the existing syntax to support this, I'm happy to review.

Otherwise I'd suggest maybe filing a ticket with the libraries using this package to support this feature. It's definitely easier than trying to construct a negative regex. For example, in something like Express you can have middleware that runs and write a line of code that says parameter !== 'foobar1' to skip the middleware on that condition.