Naive regex builder that helps henerate url matchers for $httpBackend based on routing syntax.

$httpBackend-url-matcher-builder.coffee

# https://docs.angularjs.org/api/ngMockE2E/service/$httpBackend

### @usage
path = require './path'
urlMatcher = path '/users/:guid/helloworld/:guid'

phones = [{name: 'phone1'}, {name: 'phone2'}]

$httpBackend.whenGET(urlMatcher).respond(phones)

Most of the time you just want to match on the end of the url as opposed to the full url (host header + request path)
as base addresses typically change per environment. For example, instead of matching on https://github.com/armw4,
I'd write a matcher less brittle like /armw4$/ (only testing the end of the url, excluding the scheme,
host, port, etc.). So this will suffice.
###
placeHolders =
  guid: -> "[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}"

invokePlaceholderPipeline = (pattern) ->
  accumalatorValue = pattern

  for key, valueFactory of placeHolders
    keyReplacementRegex = new RegExp ":#{key}", 'g'

    accumalatorValue = accumalatorValue.replace keyReplacementRegex, valueFactory()

  accumalatorValue

path = (requestPath) ->
  forwardSlashesEscaped = requestPath.replace(/\//g, '\\/')

  urlSelectorPattern = invokePlaceholderPipeline forwardSlashesEscaped

  urlSelectorRegex = new RegExp urlSelectorPattern

module.exports = path

# sample code
actual = 'https://github.nreca.org/users/e887e740-31f2-4530-911e-4fec9be2cc45/helloworld/e887e740-31f2-4530-911e-4fec9be2cc45'

x = path '/users/:guid/helloworld/:guid'

console.log 'it"s a match mang' if x.test actual # it"s a match mang

Snippet to escape ?:

forwardSlashesEscaped = requestPath.replace(/\//g, '\\/').replace('?', '\\?')