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RegEx in routing params

   February 24, 2021  1 Comment on RegEx in routing params

Some syntax sugar. Would be cool, if express would parse RegEx’s as a part of routing paths.

Example:

"/page/:page([0-9])"
"/skin/:direction([a-z])?/:resolution([0-9])?/:username"

Eveything in the braces should be parsed as a RegEx. That way more complex, but sweetend, paths could be built. 🙂

I know, that you can pass in RegEx’s as a path, but then you’ll end up with req.params as an array.

Yeah or No? Maybe I’ll make a PR.

Author: Fantashit

1 thought on “RegEx in routing params”

  1. Hmm.

    Isn’t app.param used for this? Of course app.param callbacks will execute for each route but if you want it only for a specific route, just add another middleware before you main callback and if the parameter doesn’t match your regex run next('route').

    app.get("/page/:page", function(req, res, next) {
  if  (!/^[0-9]+$/.test(req.params.page) next('route');
  next();
}, function(req, res, next){
  //...code that only run when `page` parameter is a integer
});

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