Fix password complexity regex for special characters (on master) (#8525)

* Fix extra space

* Fix regular expression

* Fix error template name

* Simplify check code, fix default values, add test

* Fix router tests

* Fix fmt

* Fix setting and lint

* Move cleaning up code to test, improve comments

* Tidy up variable declaration

docs/content/doc/advanced/config-cheat-sheet.en-us.md

@@ -219,7 +219,8 @@ Values containing `#` or `;` must be quoted using `` ` `` or `"""`.
     - lower - use one or more lower latin characters
     - upper - use one or more upper latin characters
     - digit - use one or more digits
-    - spec - use one or more special characters as ``][!"#$%&'()*+,./:;<=>?@\^_{|}~`-`` and space symbol. 
+    - spec - use one or more special characters as ``!"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~``
+    - off - do not check password complexity
 
 ## OpenID (`openid`)