Help another zipcode delimma

Thanks for the help on the previous question but now I have been presented with the following issue.

In the same field we have 3 different scenarios

5 digit zip
12345

6 digit zip
12345-

10 digit zip
12345-1311

I want to say give me all the zips that are 5 and 6 digits and where there is a 6 digit, dont show the
dash (-). so when my query runs they will all look like 5 digit zips. I have made a seprate query for the 10 digit.

previously I used length(zip) = 5 Received on Thu Mar 15 2007 - 15:35:26 CDT