Using Regex documents in flows

Hi all, you can add Regex documents in Studio Pro. Awesome. Even Community Commons have some, such as a good default EmailAddressRegex.   My question: Is it possible - and if so, how - to use these specific documents in flows or the isMatch() function?   I know that you can use regex resource documents as validation rules in the domain model, but that seems to me very limitted to the further use of regexes in your apps.    
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