Get a group id by name

Hi,

I have a register form and i want to automatically add the user to a group based on a year field the user fills.

For example, if this field is filled with “2022”, i want to add the user in the group “endo2022”.

I want to use this line of code :
Groups_User_Group::create( array( ‘user_id’ => $user_id, ‘group_id’ => $group_id ) );

All i need now is to get the group id i want. Can you help me ?

Thx