I'm not sure if you can accomplish what you want to do. It looks like you are trying to do two things at once.

First off, you are asking about using a multi-valued parameter. This is perfectly easy to do in CR. Create the parameter and in the options at the bottom of the dialog box, enable multiple values. The user can enter as many strings as they like.

However, in this question it appears that you want to use the string values to perform filtering on the database. In CR, you would use a mult-value parameter to do exact string matches using the IN operator: {VIEW.HOST} IN {?ParameterName}

But the IN operator doesn't support wild-cards. It can only do exact string matches. I was trying to think of away to trick CR into doing this using string manipulation, but I'm not coming up with anything. Thus, I really don't think it's possible at all.

You tested LIKE and this works for a string array? Nice. I had no idea. I'll make a note of it for future reference.

Why is your font blue? I was wondering the same thing myself.  I see this on the forum every now and then and just figured that the user clicked the font button or something. Don't know, it's a packed forum app that I downloaded.