Traefik RedirectRegex Documentation

The RedirectRegex redirects a request using regex matching and replacement.

Configuration Examples

# Redirect with domain replacement
http:
  middlewares:
    test-redirectregex:
      redirectRegex:
        regex: "^http://localhost/(.*)"
        replacement: "http://mydomain/${1}"

# Redirect with domain replacement
[http.middlewares]
  [http.middlewares.test-redirectregex.redirectRegex]
    regex = "^http://localhost/(.*)"
    replacement = "http://mydomain/${1}"

# Redirect with domain replacement
# Note: all dollar signs need to be doubled for escaping.
labels:
  - "traefik.http.middlewares.test-redirectregex.redirectregex.regex=^http://localhost/(.*)"
  - "traefik.http.middlewares.test-redirectregex.redirectregex.replacement=http://mydomain/$${1}"

// Redirect with domain replacement
// Note: all dollar signs need to be doubled for escaping.
{
  // ...
  "Tags" : [
    "traefik.http.middlewares.test-redirectregex.redirectregex.regex=^http://localhost/(.*)"
    "traefik.http.middlewares.test-redirectregex.redirectregex.replacement=http://mydomain/$${1}"
  ]
}

# Redirect with domain replacement
apiVersion: traefik.io/v1alpha1
kind: Middleware
metadata:
  name: test-redirectregex
spec:
  redirectRegex:
    regex: ^http://localhost/(.*)
    replacement: http://mydomain/${1}

Configuration Options

regex

The regex option is the regular expression to match and capture elements from the request URL.

!!! 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`.

replacement

The replacement option defines how to modify the URL to have the new target URL.

!!! warning

Care should be taken when defining replacement expand variables: `$1x` is equivalent to `${1x}`, not `${1}x` (see [Regexp.Expand](https://golang.org/pkg/regexp/#Regexp.Expand)), so use `${1}` syntax.

{% include-markdown "includes/traefik-for-business-applications.md" %}