Express routing using regular expressions with named capturing groups

app.coffee

express = require 'express'


app = express()

app.param (name, arg) -> switch Object::toString.call arg
  when '[object RegExp]'
    (req, res, next, val) ->
      if arg.test val then next() else next 'route'

app.param 'id', /^\d+$/
app.get '/things/:id', (req, res) -> res.send req.params.id

app.listen 8000