Name contain match

I've used "Contents" "contain match" with success to date my files. But I'm wondering why there is no option for "Name" to contain match? Every month, I'm downloading a PDF newsletter that is in the format: jun21issue-1389737. The problem is the numbers after "issue-" seem to be randomly generated. So I've tried using "Name" "matches" and it doesn't work because it's not an exact match. Thank you.