The express route parser is incorrectly detecting routes that it should not

I am encountering an issue with the following two routes:

router.get('/:postId([0-9]*)', handler) 
router.get('/:postId([0-9]*)/like', handler)

The first route is intended to only capture URLs like /posts/4352/, not /posts/3422/like. However, it seems to be matching both. I tested this using the official express route tester tool and it worked as expected there. (Try entering /posts/:postId([0-9]*) and /posts/2/like in the tester to see it doesn't match.)

What could be causing this incorrect matching in my case?

Note: I am aware that reordering the routes will fix the issue, but I am curious about why this behavior is occurring.

javascriptregexexpressroutes

Answer №1

If you reverse the order, it will find a match based on the first hit unless next() is utilized, in which case it will not search for another match.

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