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Regex 101

Screenshot of regex101.com captured 2026-07-20
Page preview · captured 2026-07-20

Resurfaced independently across 11 calendar years, with breakout response in 2 of them.

submissions
25
submitters
20
observed span
2013–2025
peak thread · 77 comments
303 pts
latest 20+ return · 2018-08-25
21 pts

Submission timeline

2007–2026

One slot for every year since HN launched. Height is that year's peak points; orange marks a 100+ point or 50+ comment breakout. Select a bar to open its strongest thread.

First comments on top threads

HN comment order

Other Regex resources I like include: http://regexone.com/ http://www.rexegg.com/ http://eloquentjavascript.net/09_regexp.html http://www.cheatography.com/davechild/cheat-sheets/regular-e... http://www.smashingmagazine.com/2009/06/essential-guide-to-r... http://www.smashingmagazine.com/2009/05/introduction-to-adva...

Hey I have recently released a new update for regex101 where I pretty much recoded everything; the entire explaination and colorizer engine. They are still not perfect, and I'm not fully satisfied with the code, but its way way better than it was before. I will probably remake it when I get more time on my hands. A list of all that has been fixed would take too long to write up, but I have added some of the things…

http://rubular.com/ is also really great! I use it often when programming ruby regular expressions. Fill in a batch of test strings into the box, then run your regular expression against it, and instantly see (visually) what is happening. This is a BIG plus coming from perl regex 10 years ago ;) This is not a dig a perl regex, but I just remember it was a trial and error loop, where I would continually be iterating the script to see…

Been using this for years, and it's incredibly helpful. Thanks!

The first top-level comment from each of the four biggest threads, in HN’s own order. Excerpts are shortened; open a comment for full context.

Breakout years
2

100+ points or 50+ comments

Total points
716

reference only — not used in Hall rules or ranking

Total comments
193

reference only — not used in Hall rules or ranking

Every submission

DateTitle as submittedByPointsComments
2013-01-02Regular Expressions 101nickmain41
2013-07-20Just released a major update for my site. What do you guys think?First breakoutLindrian16177
2013-09-28RegEx101.com now offers a debuggerLindrian15530
2013-11-26I have completely recoded my regex testing service. What do you think?Lindrian11
2013-11-26Show HN: my improved regex testing and debugging service, regex101Lindrian31
2014-05-01A new version of RegEx101 has been released, feedback much appreciatedLindrian10
2014-11-28Unit testing for regex regex101.com – thoughts?Lindrian11
2014-12-11Regex101stclaus30
2015-04-23Online regular expression builder, tester and debuggerTreffynnon10
2015-05-21Regex101 – Online regex tester, debugger with group highlightingXmindz40
2015-07-09Online regex tester and debuggerchaosmachine10
2015-09-02Online regex tester and debuggercattail10
2016-04-17Unit test all your regex-patterns in different parsersScrayos40
2016-06-29Regex 101: Regex tester and debuggerm4tthumphrey30
2016-11-07Online Regex Tester and Debugger: PHP, PCRE, Python, Golang and JavaScriptIvoah10
2016-11-15Regex 101Hall induction · Best threadadamnemecek30367
2018-08-25Show HN: Online Regex Tester for PHP, PCRE, Python, Golang and JavaScriptLatest 20+ point returnoctosphere217
2020-10-04Online Regex Testertallgiraffe20
2021-12-02Regex101animal_spirits141
2022-03-11Regex 101mooreds63
2022-06-04Regex Made Easybugswriter30
2023-07-18Regex 101visviva10
2023-08-14Build, Test, and Debug Regex OnlineRojerGS10
2024-06-29Regex101 works offline. Turn off WiFi before opening linkandrei-akopian30
2025-09-03Regular Expressions 101 – regex visualiser and debuggerrgs184