Show HN: Rgx.tools – Generate Regex from Text Using GPT

Hey HN,

As an afternoon project, I created a simple tool that generates regex expressions from plain text using GPT-3.5.

It's designed to help anyone who needs to quickly create regex patterns without manually writing them

Show HN: Rgx.tools – Generate Regex from Text Using GPT
rgx.tools

haha

I'm using a private package I built for safely parsing GPT responses. chances are you did spill its guts, but if the parser doesn't recognize the pattern, you won't see the response :)

I think this is the prompt?

Return a regex matching user input. Answer in this format "^.*$", nothing else: "Validate a password with at least 8 characters, one uppercase, one lowercase, and one number".

This looks great, I will use it in my tool (https://tablesmith.io/) and let user filter by regex. One suggestion is also let user input some positive/negative test cases, and test them automatically.

That's fantastic! Sounds like you're generating until the regex parses the input. This eventually works against my attack, because no jailbreak is 100% successful. It will eventually generate an accepting regex.

Given this information, I have a new attack hypothesis: To succeed, an attack must yield a regex that

a) parses the original attack statement

b) also contains the system prompt

So it would be a kind of bizarre Attack Quine! Fascinating!

I'll give the approach a try, and report the results!

P.S. If you're interested in open sourcing you sanitizer, let me know and I'll contribute some code janitor work and some redteam/blueteam work.

Thank you for sharing your work and insight!