SharePoint list How to restrict input value format

I have a column with name Secure in my SharePoint list. And I want to set validation in that column as below mentioned conditions. and if any user not entered in that format than , he will not able to save the form.

Condition :-

  1. it should contain total 12 characters
  2. first four character should be Alphabet (i.e. A to Z)
  3. next 4 characters should be any number between 0 to 9
  4. next 4 character should follow DDMM format (i.e. DD should allow maximum value 31/30/29/28 as per month and MM should between 01 to 12)