Life & fun · December 15, 2025
Generate Passwords from Regex Constraints
I built a simple web page that checks whether two JavaScript regex are equivalent (i.e. match exactly the same strings). If the two regex are not equivalent, the tool shows example strings that match one regex but not the other. The most common JavaScript regex syntax features are supported. Some more exotic features like back references are not supported. For anchors (^/$) and lookahead assertions, support is a bit wonky. The UI is vibe coded but the algorithmic machinery underneath is completely hand written.
Generate Passwords from Regex Constraints launched on December 15, 2025 with 8 votes, #1,039 of 11,628 launches that month and more than 75% of that year's launches.
Does a similar job
all alternatives →
Regex Cheatsheet2020 · ihateregex.io · ▲499A modern regular expression playground with live matching, visual railroad diagrams, rich notes, and easy sharing.
Matches.js -- Powerful Pattern Matching for Javascript2012 · github.com · ▲96Powerful pattern matching for Javascript. Contribute to natefaubion/matches.js development by creating an account on GitHub.
- RRRegexGo – Regex Generator from Examples2023 · regexgo.com · ▲8
You can enter strings to match/not match and the generator will spit out an according regex. It's not 100% accurate, but I feel like this could still be useful in at least getting a starting point when initially trying to make a regex?
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