Update route guide

en/guide/routing.md

@@ -14,7 +14,7 @@ For an introduction to routing, see [Basic routing](/{{ page.lang }}/starter/bas
 
 You define routing using methods of the Express `app` object that correspond to HTTP methods;
 for example, `app.get()` to handle GET requests and `app.post` to handle POST requests. For a full list,
-see [app.METHOD](/{{ page.lang }}/4x/api.html#app.METHOD). You can also use [app.all()](/{{ page.lang }}/4x/api.html#app.all) to handle all HTTP methods and [app.use()](/{{ page.lang }}/4x/api.html#app.use) to
+see [app.METHOD](/{{ page.lang }}/5x/api.html#app.METHOD). You can also use [app.all()](/{{ page.lang }}/5x/api.html#app.all) to handle all HTTP methods and [app.use()](/{{ page.lang }}/5x/api.html#app.use) to
 specify middleware as the callback function (See [Using middleware](/{{ page.lang }}/guide/using-middleware.html) for details).
 
 These routing methods specify a callback function (sometimes called "handler functions") called when the application receives a request to the specified route (endpoint) and HTTP method. In other words, the application "listens" for requests that match the specified route(s) and method(s), and when it detects a match, it calls the specified callback function.
@@ -39,7 +39,7 @@ app.get('/', (req, res) => {
 
 A route method is derived from one of the HTTP methods, and is attached to an instance of the `express` class.
 
-The following code is an example of routes that are defined for the GET and the POST methods to the root of the app.
+The following code is an example of routes that are defined for the `GET` and the `POST` methods to the root of the app.
 
 ```js
 // GET method route
@@ -54,9 +54,9 @@ app.post('/', (req, res) => {
 ```
 
 Express supports methods that correspond to all HTTP request methods: `get`, `post`, and so on.
-For a full list, see [app.METHOD](/{{ page.lang }}/4x/api.html#app.METHOD).
+For a full list, see [app.METHOD](/{{ page.lang }}/5x/api.html#app.METHOD).
 
-There is a special routing method, `app.all()`, used to load middleware functions at a path for _all_ HTTP request methods. For example, the following handler is executed for requests to the route "/secret" whether using GET, POST, PUT, DELETE, or any other HTTP request method supported in the [http module](https://nodejs.org/api/http.html#http_http_methods).
+There is a special routing method, `app.all()`, used to load middleware functions at a path for _all_ HTTP request methods. For example, the following handler is executed for requests to the route `"/secret"` whether using `GET`, `POST`, `PUT`, `DELETE`, or any other HTTP request method supported in the [http module](https://nodejs.org/api/http.html#http_http_methods).
 
 ```js
 app.all('/secret', (req, res, next) => {
@@ -69,19 +69,24 @@ app.all('/secret', (req, res, next) => {
 
 Route paths, in combination with a request method, define the endpoints at which requests can be made. Route paths can be strings, string patterns, or regular expressions.
 
-The characters `?`, `+`, `*`, and `()` are subsets of their regular expression counterparts. The hyphen (`-`) and the dot (`.`) are interpreted literally by string-based paths.
+{% capture caution-character %} In express 5, the characters `?`, `+`, `*`, `[]`, and `()` are handled differently than in version 4, please review the [migration guide](/{{ page.lang }}/guide/migrating-5.html#path-syntax) for more information.{% endcapture %}
 
-If you need to use the dollar character (`$`) in a path string, enclose it escaped within `([` and `])`. For example, the path string for requests at "`/data/$book`", would be "`/data/([\$])book`".
+{% include admonitions/caution.html content=caution-character %}
 
-<div class="doc-box doc-info" markdown="1">
-  Express uses [path-to-regexp](https://www.npmjs.com/package/path-to-regexp) for matching the route paths; see the path-to-regexp documentation for all the possibilities in defining route paths. [Express Route Tester](http://forbeslindesay.github.io/express-route-tester/) is a handy tool for testing basic Express routes, although it does not support pattern matching.
-</div>
+{% capture note-dollar-character %}In express 4, regular expression characters such as `$` need to be escaped with a `\`.
+{% endcapture %}
 
-<div class="doc-box doc-warn" markdown="1">
-Query strings are not part of the route path.
-</div>
+{% include admonitions/caution.html content=note-dollar-character %}
+
+{% capture note-path-to-regexp %}
+  Express uses [path-to-regexp](https://www.npmjs.com/package/path-to-regexp) for matching the route paths; see the path-to-regexp documentation for all the possibilities in defining route paths. [Express Playground Router](https://bjohansebas.github.io/playground-router/) is a handy tool for testing basic Express routes, although it does not support pattern matching.
+{% endcapture %}
 
-Here are some examples of route paths based on strings.
+{% include admonitions/note.html content=note-path-to-regexp %}
+
+{% include admonitions/warning.html content="Query strings are not part of the route path." %}
+
+### Route paths based on strings
 
 This route path will match requests to the root route, `/`.
 
@@ -107,7 +112,11 @@ app.get('/random.text', (req, res) => {
 })
 ```
 
-Here are some examples of route paths based on string patterns.
+### Route paths based on string patterns
+
+{% capture caution-string-patterns %} The string patterns in Express 5 no longer work. Please refer to the [migration guide](/{{ page.lang }}/guide/migrating-5.html#path-syntax) for more information.{% endcapture %}
+
+{% include admonitions/caution.html content=caution-string-patterns %}
 
 This route path will match `acd` and `abcd`.
 
@@ -141,7 +150,7 @@ app.get('/ab(cd)?e', (req, res) => {
 })
 ```
 
-Examples of route paths based on regular expressions:
+### Route paths based on regular expressions
 
 This route path will match anything with an "a" in it.
 
@@ -195,6 +204,11 @@ Request URL: http://localhost:3000/plantae/Prunus.persica
 req.params: { "genus": "Prunus", "species": "persica" }
 ```
 
+{% capture warning-regexp %}
+In express 5, Regexp characters are not supported in route paths, for more information please refer to the [migration guide](/{{ page.lang }}/guide/migrating-5.html#path-syntax).{% endcapture %}
+
+{% include admonitions/caution.html content=warning-regexp %}
+
 To have more control over the exact string that can be matched by a route parameter, you can append a regular expression in parentheses (`()`):
 
 ```
@@ -203,13 +217,13 @@ Request URL: http://localhost:3000/user/42
 req.params: {"userId": "42"}
 ```
 
-<div class="doc-box doc-warn" markdown="1">
-Because the regular expression is usually part of a literal string, be sure to escape any <code>\</code> characters with an additional backslash, for example <code>\\d+</code>.
-</div>
+{% include admonitions/warning.html content="Because the regular expression is usually part of a literal string, be sure to escape any `\` characters with an additional backslash, for example `\\d+`." %}
 
-<div class="doc-box doc-warn" markdown="1">
-In Express 4.x, <a href="https://github.com/expressjs/express/issues/2495">the <code>*</code> character in regular expressions is not interpreted in the usual way</a>. As a workaround, use <code>{0,}</code> instead of <code>*</code>. This will likely be fixed in Express 5.
-</div>
+{% capture warning-version %}
+In Express 4.x, <a href="https://github.com/expressjs/express/issues/2495">the `*` character in regular expressions is not interpreted in the usual way</a>. As a workaround, use `{0,}` instead of `*`. This will likely be fixed in Express 5.
+{% endcapture %}
+
+{% include admonitions/warning.html content=warning-version %}
 
 <h2 id="route-handlers">Route handlers</h2>
 
@@ -283,20 +297,20 @@ The methods on the response object (`res`) in the following table can send a res
 
 | Method                                                          | Description                                                                           |
 | --------------------------------------------------------------- | ------------------------------------------------------------------------------------- |
-| [res.download()](/{{ page.lang }}/4x/api.html#res.download)     | Prompt a file to be downloaded.                                                       |
-| [res.end()](/{{ page.lang }}/4x/api.html#res.end)               | End the response process.                                                             |
-| [res.json()](/{{ page.lang }}/4x/api.html#res.json)             | Send a JSON response.                                                                 |
-| [res.jsonp()](/{{ page.lang }}/4x/api.html#res.jsonp)           | Send a JSON response with JSONP support.                                              |
-| [res.redirect()](/{{ page.lang }}/4x/api.html#res.redirect)     | Redirect a request.                                                                   |
-| [res.render()](/{{ page.lang }}/4x/api.html#res.render)         | Render a view template.                                                               |
-| [res.send()](/{{ page.lang }}/4x/api.html#res.send)             | Send a response of various types.                                                     |
-| [res.sendFile()](/{{ page.lang }}/4x/api.html#res.sendFile)     | Send a file as an octet stream.                                                       |
-| [res.sendStatus()](/{{ page.lang }}/4x/api.html#res.sendStatus) | Set the response status code and send its string representation as the response body. |
+| [res.download()](/{{ page.lang }}/5x/api.html#res.download)     | Prompt a file to be downloaded.                                                       |
+| [res.end()](/{{ page.lang }}/5x/api.html#res.end)               | End the response process.                                                             |
+| [res.json()](/{{ page.lang }}/5x/api.html#res.json)             | Send a JSON response.                                                                 |
+| [res.jsonp()](/{{ page.lang }}/5x/api.html#res.jsonp)           | Send a JSON response with JSONP support.                                              |
+| [res.redirect()](/{{ page.lang }}/5x/api.html#res.redirect)     | Redirect a request.                                                                   |
+| [res.render()](/{{ page.lang }}/5x/api.html#res.render)         | Render a view template.                                                               |
+| [res.send()](/{{ page.lang }}/5x/api.html#res.send)             | Send a response of various types.                                                     |
+| [res.sendFile()](/{{ page.lang }}/5x/api.html#res.sendFile)     | Send a file as an octet stream.                                                       |
+| [res.sendStatus()](/{{ page.lang }}/5x/api.html#res.sendStatus) | Set the response status code and send its string representation as the response body. |
 
 <h2 id="app-route">app.route()</h2>
 
 You can create chainable route handlers for a route path by using `app.route()`.
-Because the path is specified at a single location, creating modular routes is helpful, as is reducing redundancy and typos. For more information about routes, see: [Router() documentation](/{{ page.lang }}/4x/api.html#router).
+Because the path is specified at a single location, creating modular routes is helpful, as is reducing redundancy and typos. For more information about routes, see: [Router() documentation](/{{ page.lang }}/5x/api.html#router).
 
 Here is an example of chained route handlers that are defined by using `app.route()`.
 
@@ -356,7 +370,7 @@ app.use('/birds', birds)
 
 The app will now be able to handle requests to `/birds` and `/birds/about`, as well as call the `timeLog` middleware function that is specific to the route.
 
-But if the parent route `/birds` has path parameters, it will not be accessible by default from the sub-routes. To make it accessible, you will need to pass the `mergeParams` option to the Router constructor [reference](https://expressjs.com/en/4x/api.html#app.use).
+But if the parent route `/birds` has path parameters, it will not be accessible by default from the sub-routes. To make it accessible, you will need to pass the `mergeParams` option to the Router constructor [reference](/{{ page.lang }}/5x/api.html#app.use).
 
 ```js
 const router = express.Router({ mergeParams: true })