grep either or?

It's kind of hard to explain what I want to do. But say I have a directory with:

bleh_stuff
bleh_fun
bleh_games
ar_stuff
ar_fun
ar_games
ram
proc
cpu

Now, to list all the things with "bleh" in them, I'd do ls | grep bleh. Or to list everyting with "ar" in them, I'd do ls | grep ar, or to list things with both of them in there, I would do ls grep bleh | grep ar.

However, what I want to do, is list things with either "bleh" or "ar" in them. So the output would be:

bleh_stuff
bleh_fun
bleh_games
ar_stuff
ar_fun
ar_games

I searched through the man pages, and I saw you could use regex, but I'm really bad with regex.

Any ideas?

 

 

 

 

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