@regex101

Online regex tester and debugger with real-time match highlighting, detailed explanations, substitutions, unit tests, benchmarking, and code generation. Support

regex101.com
Joined December 2011
  • Tweets829
  • Following1
  • Followers5.5K
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Since everybody loves regex so much, I’ve remade the regex quiz on the site from scratch. New and improved challenges, try it on regex101.com/quiz
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Have you considered regex101 Pro but decided not to subscribe? What held you back? I’d love to hear what I could improve.
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I saw this great library submission recently, and just wanted to take the opportunity to give kudos to its author, Tiago Cussiol, and share it with you all. Super detailed description, and a 560 unit test suite to back it up: regex101.com/library/0BFrkM
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This entry also exposed a major issue in the unit tester: it was incredibly slow. This suite took over 40 seconds (!) to finish on my computer. So, naturally, I took the opportunity to improve both the UI and the engine. It now looks nicer, and finishes in 1ms on my computer.
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Due to popular demand, we’ve added a free preview mode to the regex101 debugger! 🐛 Take it for a spin and see how your regex runs, step by step. Let us know what you think!
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Try it on regex101.com or checkout the docs: docs.regex101.com/applicatio…

regex101: Online Regex Tester, Builder, Converter & Debugger

Build, test, debug and convert regex across flavors with real-time matches and clear explanations. Supports PCRE2, JavaScript, Python and more. Save and share examples.

regex101.com
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You can now convert regexes between flavors directly on regex101! Write your regex in the flavor you know best, then convert it with confidence to the flavor you need. 🔄
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How many of you still write your regexes by hand?
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What would you like to see in a desktop regex101 app?
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How do you prefer to read the changelog? Should I try to categorize it, or just keep the numbered list?
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Replying to @neo_subhamoy
regex101 is keeping the entire software industry running tbh
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There are two "ana"s in "banana". 🍌 /ana/g only finds one. /(?=(ana))/g captures both. The trick: a lookahead checks ahead without consuming characters, so overlapping captures are possible. #regex #JavaScript
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See it in action here: regex101.com/r/9QtSeL/1

regex101: JavaScript Match Workspace

Explore and test this JavaScript regular expression online. Understand the pattern with regex explanations, generate code, and export matches to CSV or JSON.

regex101.com
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Replying to @charlotteba22
100%! Regex101 has saved so many developers from endless headache.
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Have you ever saved work on regex101 without signing in? You can now recover it from the browser where you saved it and add it to your account. Manage and organize it from any device -- all for free! Look for “Recover local workspaces” on your account page.
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Replying to @1Y8__
Regex101 has saved me hours of pain.
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regex101 becomes even better with an account, but most users never sign in. What's stopping you from signing in?
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regex101 retweeted
regex101
@regex101Sep 17
What does the interest in a desktop version of regex101 look like? ❤️ Like = I’d try it 🔁 Repost = I’d actually use it Bonus: reply with macOS / Windows / Linux.
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What does the interest in a desktop version of regex101 look like? ❤️ Like = I’d try it 🔁 Repost = I’d actually use it Bonus: reply with macOS / Windows / Linux.
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