New Routing Reference Documentation

docs/content/reference/routing-configuration/http/middlewares/replacepathregex.md

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+---
+title: "Traefik ReplacePathRegex Documentation"
+description: "In Traefik Proxy's HTTP middleware, ReplacePathRegex updates paths before forwarding requests, using a regex. Read the technical documentation."
+---
+
+The `replacePathRegex` middleware will:
+
+- Replace the matching path with the specified one.
+- Store the original path in an `X-Replaced-Path` header
+
+## Configuration Examples
+
+```yaml tab="File (YAML)"
+# Replace path with regex
+http:
+  middlewares:
+    test-replacepathregex:
+      replacePathRegex:
+        regex: "^/foo/(.*)"
+        replacement: "/bar/$1"
+```
+
+```toml tab="File (TOML)"
+# Replace path with regex
+[http.middlewares]
+  [http.middlewares.test-replacepathregex.replacePathRegex]
+    regex = "^/foo/(.*)"
+    replacement = "/bar/$1"
+```
+
+```yaml tab="Kubernetes"
+# Replace path with regex
+apiVersion: traefik.io/v1alpha1
+kind: Middleware
+metadata:
+  name: test-replacepathregex
+spec:
+  replacePathRegex:
+    regex: "^/foo/(.*)"
+    replacement: "/bar/$1"
+```
+
+```yaml tab="Docker & Swarm"
+# Replace path with regex
+labels:
+  - "traefik.http.middlewares.test-replacepathregex.replacepathregex.regex=^/foo/(.*)"
+  - "traefik.http.middlewares.test-replacepathregex.replacepathregex.replacement=/bar/$$1"
+```
+
+```yaml tab="Consul Catalog"
+# Replace path with regex
+- "traefik.http.middlewares.test-replacepathregex.replacepathregex.regex=^/foo/(.*)"
+- "traefik.http.middlewares.test-replacepathregex.replacepathregex.replacement=/bar/$1"
+```
+
+## Configuration Options
+
+| Field                        | Description      | Default | Required |
+|:-----------------------------|:-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|:--------|:---------|
+| `regex` | Regular expression to match and capture the path from the request URL. | | Yes |
+| `replacement` | Replacement path format, which can include captured variables.<br /> `$1x` is equivalent to `${1x}`, not `${1}x` (see [Regexp.Expand](https://golang.org/pkg/regexp/#Regexp.Expand)), so use `${1}` syntax. | | No 
+
+!!! tip
+
+    Regular expressions and replacements can be tested using online tools such as [Go Playground](https://play.golang.org/p/mWU9p-wk2ru) or the [Regex101](https://regex101.com/r/58sIgx/2).
+
+    When defining a regular expression within YAML, any escaped character needs to be escaped twice: `example\.com` needs to be written as `example\\.com`.