docs: Prepare for new sub tree

See #11925

docs/content/en/functions/strings/FindRe.md

@@ -1,36 +0,0 @@
----
-title: strings.FindRE
-description: Returns a slice of strings that match the regular expression.
-categories: []
-keywords: []
-action:
-  aliases: [findRE]
-  related:
-    - functions/strings/FindRESubmatch
-    - functions/strings/Replace
-    - functions/strings/ReplaceRE
-  returnType: '[]string'
-  signatures: ['strings.FindRE PATTERN INPUT [LIMIT]']
-aliases: [/functions/findre]
----
-By default, `findRE` finds all matches. You can limit the number of matches with an optional LIMIT argument.
-
-{{% include "functions/_common/regular-expressions.md" %}}
-
-This example returns a slice of all second level headings (`h2` elements) within the rendered `.Content`:
-
-```go-html-template
-{{ findRE `(?s)<h2.*?>.*?</h2>` .Content }}
-```
-
-The `s` flag causes `.` to match `\n` as well, allowing us to find an `h2` element that contains newlines.
-
-To limit the number of matches to one:
-
-```go-html-template
-{{ findRE `(?s)<h2.*?>.*?</h2>` .Content 1 }}
-```
-
-{{% note %}}
-You can write and test your regular expression using [regex101.com](https://regex101.com/). Be sure to select the Go flavor before you begin.
-{{% /note %}}