RegExp

RegExp

Powerful Regex Testing Tool

0 ratings
4 reviews
Free
In-App Purchases

Details

  • Released
  • Updated
  • December 22, 2020
  • December 1, 2025

Features

RegExp screenshot #1 for iPhone
RegExp screenshot #2 for iPhone
RegExp screenshot #3 for iPhone
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About

This tool allows developers to test and explore regular expression patterns across various programming language syntaxes. It offers advanced configuration options and synchronization across devices, making it ideal for learning and building complex patterns.

Multiple regex engine support
Advanced Swift regex engine
Save and organize regex patterns
iCloud sync across devices
Supports Swift, Objective-C, ECMAScript, and Go regex flavors
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What's New in RegExp

2.3.3

December 1, 2025

- RegExp might show incorrect matches, when more than one match found with regular expression - RegExp does not render groups correctly

1

In-App Purchases

$2.99

Pro Features

Pro Features

User reviews

Best option for me

Clean, easy to read, good multiline support/editor, and lets me save multiple expressions. I tried 5 regex apps and this one was my favorite.

SO CLOSE TO PERFECT

This is the best regex app that I've used on MacOS/iOS/iPadOS. I've tried almost every single one. The iCloud sync and folder organization is terrific and better than any others. "Patterns" is wonderful but does none of this and you can't even open a new window without losing your old pattern, let alone creating a library of snippets to use. "RegEx Lab" saves them locally but does allow you to save multiples and import/export - I just wish it could save via iCloud.

That being said, there are a couple features that I consider almost a requirement that "RegExp" does not have:
1) Highlighting of the matches on your "test text" - it shows the matches in a window pane on the right along with line numbers, but it does not have line numbers on the test text pane so often it's difficult to determine what pieces from your text is actually matching.
2) Live updating - You have to click "Run" or use the shortcut "cmd r" to run the test. This can be a bit tedious, especially when paired up with the fact that there's no highlighting of the matches.

Developer: if you could implment those two features, I'd sing RegExp's praises to every colleague, student and heck, random person that I know

Note: For those who say you can't open two regular expressions at the same time, well you can. It's just a bit wonky. Click 'View' > "Show All Tabs" and it shows a tab preview like Safari, then click the " " and BAM a new tab with a new regular expression. It works perfectly, albeit not very user friendly. If the developer could just add a new tab shortcut or toolbar button, that would be terrific, but the main thing is that it works! EDIT: IT DOES HAVE A " " next to the tab, but you still need to click "Show Tab Bar" to see the tab bar and then the at the right of the single tab. YAY
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Great developer companion

I have been working on some projects requiring heavy regex usage. RegExp.app has been key to my success since I have been able to test and even improve the performance of my regular expressions. This app is very visual letting you see how the regex is processed via colored blocks that represent how pattern matching is applied.

The lead developer recently put in a small enhancement I requested which has allowed for removal vs substitution of values. This change was appreciated and works great.

The free version works nicely but the PRO version provides a ton of flexiblity.

I love this App and is the best regex app I have tried. Well worith the tiny price charged.
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почти удобно

для каждой проверки надо нажимать на кнопку, нет поддержки php

Response from developer

You can press Command+R to run the expression. And there is no php support, because I never promised it :D

Developer apps

FAQ

What regex flavors does RegExp support?

RegExp supports Swift (fully configurable), Objective-C, ECMAScript (JavaScript), and Go (macOS only, including POSIX).

Is RegExp available on all my devices?

Yes, RegExp is available on macOS, iOS, and iPadOS, with iCloud sync to keep your regex library accessible across these devices.

What are the advanced configuration options in RegExp?

The one-time purchase unlocks advanced configuration options for power users, including advanced Swift regex engine compatibility settings for behaviors like Python or Rust-style regex.

How does RegExp help me organize my patterns?

RegExp functions as a personal regex notebook, allowing you to save and organize your custom regex patterns for easy retrieval and management.

Does RegExp have ads?

No, RegExp does not contain advertisements. Most features are available for free, with an optional one-time purchase for advanced options.

When was RegExp last updated?

The latest version, 2.3.3, was last updated on December 1, 2025.

What is the age rating for RegExp?

RegExp has an age rating of 4+, making it suitable for a wide range of users.

Can I try RegExp before buying?

Yes, most features of RegExp are available for free, allowing you to test and explore its capabilities without any initial commitment.