traefik/docs/content/middlewares/redirectregex.md

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# RedirectRegex
Redirecting the Client to a Different Location
{: .subtitle }
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<!--
TODO: add schema
-->
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The RedirectRegex redirects a request using regex matching and replacement.
## Configuration Examples
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```yaml tab="Docker"
# Redirect with domain replacement
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# Note: all dollar signs need to be doubled for escaping.
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labels:
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- "traefik.http.middlewares.test-redirectregex.redirectregex.regex=^http://localhost/(.*)"
- "traefik.http.middlewares.test-redirectregex.redirectregex.replacement=http://mydomain/$${1}"
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```
```yaml tab="Kubernetes"
# Redirect with domain replacement
apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
name: test-redirectregex
spec:
redirectRegex:
regex: ^http://localhost/(.*)
replacement: http://mydomain/${1}
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```
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```yaml tab="Consul Catalog"
# Redirect with domain replacement
# Note: all dollar signs need to be doubled for escaping.
- "traefik.http.middlewares.test-redirectregex.redirectregex.regex=^http://localhost/(.*)"
- "traefik.http.middlewares.test-redirectregex.redirectregex.replacement=http://mydomain/$${1}"
```
```json tab="Marathon"
"labels": {
"traefik.http.middlewares.test-redirectregex.redirectregex.regex": "^http://localhost/(.*)",
"traefik.http.middlewares.test-redirectregex.redirectregex.replacement": "http://mydomain/${1}"
}
```
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```yaml tab="Rancher"
# Redirect with domain replacement
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# Note: all dollar signs need to be doubled for escaping.
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labels:
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- "traefik.http.middlewares.test-redirectregex.redirectregex.regex=^http://localhost/(.*)"
- "traefik.http.middlewares.test-redirectregex.redirectregex.replacement=http://mydomain/$${1}"
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```
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```yaml tab="File (YAML)"
# Redirect with domain replacement
http:
middlewares:
test-redirectregex:
redirectRegex:
regex: "^http://localhost/(.*)"
replacement: "http://mydomain/${1}"
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```
```toml tab="File (TOML)"
# Redirect with domain replacement
[http.middlewares]
[http.middlewares.test-redirectregex.redirectRegex]
regex = "^http://localhost/(.*)"
replacement = "http://mydomain/${1}"
```
## Configuration Options
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!!! 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).
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### `permanent`
Set the `permanent` option to `true` to apply a permanent redirection.
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### `regex`
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The `regex` option is the regular expression to match and capture elements from the request URL.
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### `replacement`
The `replacement` option defines how to modify the URL to have the new target URL.
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!!! 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.