using regexp_matches and array manipulation

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Can anyone give me an example of how to use regexp_matches and use the
captured values?

For instance, if I have a delimited string "a,b,c" and I want to put
each letter into a variable so I can subsequently use those variables in
an insert statement, how would I do that? I know regexp_matches returns
a text array, but how do I assign the value to an array and then access
those values?

leaselog=# select regexp_matches('a,b,c','(.*),(.*),(.*)');

~ regexp_matches
- ----------------
~ {a,b,c}
(1 row)

I've tried select into, but that just created a table and didn't put the
values into an array variable.
leaselog=# select regexp_matches('a,b,c','(.*),(.*),(.*)') into foo;

Thanks in advance!

Rgds,

Bret
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