# RegExp — Powerful Regex Testing Tool

> A developer tool for testing and exploring regular expression patterns. (iPhone/iPad app by Loshadki, LLC.)

- Source: https://appshunter.io/ios/app/regexp/id1546140065 (this page in markdown: same URL + `.md`)
- Developer: [Loshadki, LLC](https://appshunter.io/developer/1546140307)
- Category: Developer Tools, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 18.1 · 3 MB
- Languages: American English
- Released: 2020-12-22
- Data updated: 2026-08-15
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/regexp/id1546140065/reviews.md

## What is RegExp?

Available on macOS, iOS and iPadOS

A powerful and flexible Regular Expression (Regex) testing tool designed for developers.

Test and explore regex patterns across multiple flavors:

- Swift (fully configurable)
- Objective-C
- ECMAScript (JavaScript)
- Go (macOS only)
- Go (POSIX) (macOS only)

Most features are available for free, so you can try the app without any commitment. A one-time purchase unlocks advanced configuration options for power users.

Key Features:

- Support for multiple regex engines and syntax variations
- Advanced Swift regex engine with compatibility options (e.g., Python, Rust-style behavior)
- Save and organize your own regex patterns like a personal regex notebook
- iCloud sync to keep your regex library backed up and accessible across devices

Whether you’re learning regex, testing expressions, or building complex patterns, this app is designed to make your workflow faster and more reliable.

## Key features

- 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

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Pro Features | $2.99 | one-time |


## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/regexp/id1546140065/reviews.md

### 5/5 — Best option for me

*2025-04-07*

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.

### 4/5 — SO CLOSE TO PERFECT

*2023-04-18*

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

### 5/5 — Great developer companion

*2023-01-21*

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.

### 4/5 — почти удобно

*2021-08-30*

для каждой проверки надо нажимать на кнопку, нет поддержки php

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

## Frequently asked questions about RegExp

### 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.

## Version history (last 2 releases)

### 2.3.3 — 2025-12-01

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

### 2.3.1 — 2025-09-16

No release notes.

## Apps similar to RegExp

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [RegExpress](https://appshunter.io/ios/app/regexpress/id6745237099) | — | Free | Developer Tools |
| [OctView - Repo Manager](https://appshunter.io/ios/app/octview-repo-manager/id6747004245) | — | Free | Developer Tools |
| [Regex Tester - Live Match](https://appshunter.io/ios/app/regex-tester-live-match/id6763340858) | 5.0 (1) | Free | Developer Tools |
| [RegEx Verifier](https://appshunter.io/ios/app/regex-verifier/id6749697514) | — | Free | Developer Tools |
| [Regex Parse & Replace Dev Tool](https://appshunter.io/ios/app/regex-parse-and-replace-dev-tool/id6757801594) | 5.0 (1) | Free | Developer Tools |
| [DevBuddy Dev Tools](https://appshunter.io/ios/app/devbuddy-dev-tools/id6760576492) | — | Free | Developer Tools |

## More apps by Loshadki, LLC

- [ShellHistory](https://appshunter.io/ios/app/shellhistory/id1564015476)
- [CheckCraft](https://appshunter.io/ios/app/checkcraft/id6469945468)
- [ImmersiShare](https://appshunter.io/ios/app/immersishare/id6477474229)

All apps by Loshadki, LLC: https://appshunter.io/developer/1546140307

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-15.*