traefik/docs/content/middlewares/redirectregex.md

TODO - RedirectRegex

Redirecting the Client to a Different Location {: .subtitle }

TODO: add schema

RegexRedirect redirect a request from an url to another with regex matching and replacement.

Configuration Examples

??? example "File -- Redirect with domain replacement"

```toml
[http.middlewares]
  [http.middlewares.test-redirectregex.redirectregex]
    regex = "^http://localhost/(.*)"
    replacement = "http://mydomain/$1"
```

??? example "Docker -- Redirect with domain replacement"

```yml
 a-container:
    image: a-container-image 
        labels:
            - "traefik.http.middlewares.test-redirectregex.redirectregex.regex=^http://localhost/(.*)"
            - "traefik.http.middlewares.test-redirectregex.redirectregex.replacement=http://mydomain/$1"
```

Configuration Options

permanent

Set the permanent option to true to apply a permanent redirection.

regex

The Regex option is the regular expression to match and capture elements form the request 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.

!!! 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).

replacement

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