Creating a precise regular expression for route length in Express JS

Currently, I am facing an issue while setting a route in my application. I want the URL parameter to be exactly 2 characters long, but unfortunately, the following code snippet is not producing the desired result:

app.all('/:lng{2}?',function (req, res, next) {
 // my code ...
});

It seems that the :lng parameter is not limited to exactly 2 characters and specifying {2} in the code does not seem to make any difference.

If anyone has a solution to this problem, I would greatly appreciate your assistance. Thank you.

Answer №1

Instead of using a simple string, it is important to utilize an actual regular expression:

app.all(/^\/(\w{2})?$/, function (req, res, next) {
 // your code here ...
});

The parentheses create a capturing group, allowing the value to be accessed in req.params[0]. Modify \w according to your specific needs.

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