RegEx Lab: Regular Expressions

This app is constantly improving and is the best app that I have found in its category of working with regular expressions. Thanks to the developer for such a useful app.

The app is amazing and works great. The latest update is making things better than ever before! Thanks for the great work!

The developer has put no effort into the Mac version.

sometimes regex apps and websites over complicate the interface making it tiresome looking at. i goto this app because it gets the job done and i'm not annoyed.

I have been playing with regular expressions for almost 40 years, and I have relearned it over a dozen times. This is a very nice implementation for extracting data from text. I find it useful for doing simple tasks and practicing/learning.

Most regex apps I've tried are good for only testing whether your expression is valid, etc. This one goes further with find-and-replace and outputing capture groups. I love this app so much I'm not even going to ding it for how much I hate its thematic color! This app makes it easy to quickly select the output and copy it to run a new regex on it. There's a lovely button that selects the whole output for you so you can easily copy and paste it wherever. (Suggestion: Is it possible to add a button that not only selects the whole output but also copies and replaces the text on the previous screen, i.e., the un-regexed stuff, if that makes sense?)

Wow this app is great! I’m just learning RegEx and it’s so much easier to see instant feedback on these cryptic codes.

RegEx matching works well but It was difficult to figure out how the replace function worked. I received an immediate and clear response to my request for support so I’m a happy camper.

Update maybe 18 months later: INCREASING FROM 4 TO 5 STARS. Finally had a real use for this app. After re-learning regular expressions from Corey Schafer’s best-on-the-web YouTube tutorial, I used the app to develop an expression that I really, really needed for another hobby. WORKED GREAT!! I still would like to be able to see the text and replacement text simultaneously. (May be possible; still don’t know.) Feb 17: After using it some more increasing it to 4 stars. Would like to have the replace window and visible simultaneously with scanned text but maybe that is possible too and I haven't found it yet. Rating: 1 star. Am I dumb or what? The one thing I wanted was the cheat sheet to use to better learn about regular expressions. In the App Store they claim to have to have one but I can’t find it. Ok, I found it. Increasing rating to 4 until I decide if it is useful. On a second visit I couldn’t find it again! Finally! The cheat sheet should be accessible from any page of the app. This is a crap tool for learning regexes. Decreasing rating to 3. The “light/dark” highlighting is terrible. Looking for a way to turn that off. No luck so far. OK, I got control of the dang “theme”. Still a pain in the neck. I don’t get it. I was seeing a keyboard with an extra row with meta characters; very nice. Now it is gone, and I can’t get it back. But I do have access to emojis. How useless! A complete mess. Lowering to 2 stars. Needs a user manual.

It’s so refreshing to have something that works on mobile. I love using the shortcuts app, so this is handy when I’m away from home. I could use regex101 on safari, but this app saves loads of time.