traefik/docs/content/middlewares/replacepathregex.md

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# ReplacePathRegex
Updating the Path Before Forwarding the Request (Using a Regex)
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{: .subtitle }
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<!--
TODO: add schema
-->
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The ReplaceRegex replaces the path of a URL using regex matching and replacement.
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## Configuration Examples
```yaml tab="Docker"
# Replace path with regex
labels:
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- "traefik.http.middlewares.test-replacepathregex.replacepathregex.regex=^/foo/(.*)"
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- "traefik.http.middlewares.test-replacepathregex.replacepathregex.replacement=/bar/$$1"
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```
```yaml tab="Kubernetes"
# Replace path with regex
apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
name: test-replacepathregex
spec:
replacePathRegex:
regex: ^/foo/(.*)
replacement: /bar/$1
```
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```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"
```
```json tab="Marathon"
"labels": {
"traefik.http.middlewares.test-replacepathregex.replacepathregex.regex": "^/foo/(.*)",
"traefik.http.middlewares.test-replacepathregex.replacepathregex.replacement": "/bar/$1"
}
```
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```yaml tab="Rancher"
# Replace path with regex
labels:
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- "traefik.http.middlewares.test-replacepathregex.replacepathregex.regex=^/foo/(.*)"
- "traefik.http.middlewares.test-replacepathregex.replacepathregex.replacement=/bar/$1"
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```
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```yaml tab="File (YAML)"
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# Replace path with regex
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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"
```
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## Configuration Options
### General
The ReplacePathRegex middleware will:
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- replace the matching path with the specified one.
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- store the original path in a `X-Replaced-Path` header.
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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 [Regex101](https://regex101.com/r/58sIgx/2).
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### `regex`
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The `regex` option is the regular expression to match and capture the path from the request URL.
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### `replacement`
The `replacement` option defines the replacement path format, which can include captured variables.
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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.