[4.1] Creating a new Category from frontend

[muba4]

I have:

1. The ID of the parent Category in which you want to create a new Category.
2. An array of required fields of the Category (from the frontend's form).

I need (using the features of Joomla, without creating a new component):

1. Before saving:
   1.1. How do I check the validity of these fields?
   1.2. How to change the Category Alias created automatically (if the user didn't enter it when filling out the form)?
   1.3 How to make my own processing of the fields with regular expressions?

2. Create a New Category (with a set of modified fields from frontend).

3. After successful saving get ID of the new Category.

Environment:

• PHP 8.1.7
• nginx/1.23.0
• Joomla! 4.1.5 Stable [ Kuamini ] 21-June-2022 14:00 GMT

[muba4]

Thanks to the friendly community!
=/

Here's an idea of the solution:
https://joomla.stackexchange.com/questions/31743/create-a-category-from-frontend-in-joomla-4