Needed a writer that would let me take actions based on input but didn't want much fuss, wrote a thing:
https://github.com/timdufrane/regexwriter/. I'm no good at this "Github" stuff or this "good code" stuff but this did the trick for my use case and maybe it can help someone else. I'm open to suggestions for improvements, or a heads up if there's something built-in or out there already that does this better. Thanks!