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Mention escaping escape characters in YAML for regex usage

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Jack Morgan 2021-10-06 22:36:11 +13:00 • committed by GitHub
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docs/content/middlewares/http/headers.md
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@ -333,7 +333,9 @@ It allows all origins that contain any match of a regular expression in the `acc
!!! tip
Regular expressions 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).
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`.
### `accessControlExposeHeaders`