Using underscore as single char wildcard

[MitraMIS]

Hello All;

I'm trying to make a prompt with the option of single char wild card.

The wild card char is underscore.

If I enter 12_123 in my prompt I would get below parts;

12 1 123
12 2 123
12 3 123

what I need to do is to do two single char wildcard like;

12_123_789

and get

12 1 123 4 789
12 2 123 5 789

How can I do this?

My filter looks like this;

item nbr like ?item prompt?

TIA

Mitra