Search for user by specific 12 digit ID number I'm building some functionality into a drupal 7 site that will let users search for another user, by a 12 digital identity number (for example: ZD-3423FGIO-XZ) 

How would I go about doing this? Would I need to create some custom code to insert a new field in the user table that creates a custom number then modify the search functionality, or would I just use a module to do this?

Any help would be great!
It seems to me like a typical use case for Field UI and Views. No code needed.

Video tutorials on Drupal 7, (Fields from episode 9), and Views.