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88 lines
2.5 KiB
Markdown
88 lines
2.5 KiB
Markdown
---
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title: "Traefik ReplacePathRegex Documentation"
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description: "In Traefik Proxy's HTTP middleware, ReplacePathRegex updates paths before forwarding requests, using a regex. Read the technical documentation."
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---
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# ReplacePathRegex
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Updating the Path Before Forwarding the Request (Using a Regex)
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{: .subtitle }
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<!--
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TODO: add schema
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-->
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The ReplaceRegex replaces the path of a URL using regex matching and replacement.
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## Configuration Examples
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```yaml tab="Docker & Swarm"
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# Replace path with regex
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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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```
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```yaml tab="Kubernetes"
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# Replace path with regex
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apiVersion: traefik.io/v1alpha1
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kind: Middleware
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metadata:
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name: test-replacepathregex
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spec:
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replacePathRegex:
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regex: ^/foo/(.*)
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replacement: /bar/$1
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```
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```yaml tab="Consul Catalog"
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# Replace path with regex
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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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```
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```yaml tab="File (YAML)"
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# Replace path with regex
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http:
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middlewares:
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test-replacepathregex:
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replacePathRegex:
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regex: "^/foo/(.*)"
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replacement: "/bar/$1"
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```
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```toml tab="File (TOML)"
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# Replace path with regex
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[http.middlewares]
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[http.middlewares.test-replacepathregex.replacePathRegex]
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regex = "^/foo/(.*)"
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replacement = "/bar/$1"
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```
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## Configuration Options
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### General
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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
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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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When defining a regular expression within YAML, any escaped character needs to be escaped twice: `example\.com` needs to be written as `example\\.com`.
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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`
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The `replacement` option defines the replacement path format, which can include captured variables.
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!!! warning
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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.
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