Revert "migrate docs to mdx"

This reverts commit 3cb12b5a52.

website/docs/language/functions/regexall.mdx

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----
-page_title: regexall - Functions - Configuration Language
-description: >-
-  The regex function applies a regular expression to a string and returns a list
-  of all matches.
-sidebar_title: regexall
----
-
-# `regexall` Function
-
-`regexall` applies a
-[regular expression](https://en.wikipedia.org/wiki/Regular_expression)
-to a string and returns a list of all matches.
-
-```hcl
-regexall(pattern, string)
-```
-
-`regexall` is a variant of [`regex`](/language/functions/regex) and uses the same pattern
-syntax. For any given input to `regex`, `regexall` returns a list of whatever
-type `regex` would've returned, with one element per match. That is:
-
-- If the pattern has no capture groups at all, the result is a list of
-  strings.
-- If the pattern has one or more _unnamed_ capture groups, the result is a
-  list of lists.
-- If the pattern has one or more _named_ capture groups, the result is a
-  list of maps.
-
-`regexall` can also be used to test whether a particular string matches a
-given pattern, by testing whether the length of the resulting list of matches
-is greater than zero.
-
-## Examples
-
-```
-> regexall("[a-z]+", "1234abcd5678efgh9")
-[
-  "abcd",
-  "efgh",
-]
-
-> length(regexall("[a-z]+", "1234abcd5678efgh9"))
-2
-
-> length(regexall("[a-z]+", "123456789")) > 0
-false
-```
-
-## Related Functions
-
-- [`regex`](/language/functions/regex) searches for a single match of a given pattern, and
-  returns an error if no match is found.
-
-If Terraform already has a more specialized function to parse the syntax you
-are trying to match, prefer to use that function instead. Regular expressions
-can be hard to read and can obscure your intent, making a configuration harder
-to read and understand.