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Regex Lab
Text InputDescribe a pattern in English, get a regex with an explanation — and test it live with match highlighting.
Why On-Device?
A regex assistant that lives in your dev workflow: instant, offline, and free to iterate against as many test strings as you like.
Interactive Demo
Prompt API: Loading...
//
Test String 0 matches
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The launch is planned for 2026-07-29, with a fallback on 2026-08-15.
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This this sentence has has some duplicate words words.
Matches
Generate a regex (or type one) to see its matches.
Implementation Code
demo.js
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56 demos, all running on-device.
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Prompt API