Regex Challenge
Write one regular expression a day that extracts the target from each string
Regex Challenge gives you a set of test strings, each with a highlighted target, and you write a single regular expression that matches exactly those targets. A new puzzle appears every day, and difficulty follows the day of the week, starting easy.
Free · No login · Browser · New puzzle daily
About Regex Challenge
It trains practical regex writing: anchors, groups, character classes and lookarounds against real-looking text. Early-week puzzles suit beginners and later ones suit people who already use regex at work.
It runs in the browser and you can play as a guest. A free account saves scores, tracks daily streaks and puts you on a leaderboard. You can step back through previous days.
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Tips and discussion
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