Dynamic pages cannot use hyphen.

Hey all! The dynamic pages that drive our client’s blog seem to no longer be able to use a hyphen between page properties – www.website.com/resources/[slug]/[title]-[id] for example. The default to the backslash would ordinarily be alright, if we didn’t already share out links with the hyphen (while it was working) that we can’t go back through and retroactively change. Any way around this?