# RegEx Knife

> Utilities

Canonical page: [https://chrome-stats.com/d/id894169288](https://chrome-stats.com/d/id894169288)

## Overview

- **ID:** `id894169288`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Mark Alldritt
- **Category:** Utilities
- **Rating:** 4.30 / 5 (25 ratings)
- **Version:** 2.0.2
- **Last updated:** 2020-09-10
- **First published:** 2014-07-20
- **Size:** 3.71 MB
- **Data as of:** 2026-09-26
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/regex-knife/id894169288)
- **Website:** [http://markalldritt.com/?page\_id=800](http://markalldritt.com/?page_id=800)
- **Privacy policy:** [http://markalldritt.com/?page\_id=1296](http://markalldritt.com/?page_id=1296)

## Description

RegEx Knife is an easy and useful tool for working with Regular Expressions.  RegEx Knife is unique in how it allows you to highlight capture groups within a Regular Expression, edit them and immediately see the results.  RegEx Knife also makes it easy to experiment with regular expression substitutions. 

Version 2 retains the simplicity of the original RegEx Knife, with the added advantage that it works on your iPhone as well as your iPad.

## Rankings

- #234,651 — Overall

## Review summary

RegEx Knife is praised as a handy, easy-to-use tool for testing and storing regex patterns with clear visual feedback. Users value its quick testing workflow, simple interface, and support for storing and reusing expressions. However, recurring issues temper the praise: frequent crashes and instability; dark-mode UI problems such as unreadable text or hidden elements; saving/loading glitches and occasional data inconsistencies; and navigation quirks like difficulty exiting a custom RegEx back to the main menu. Some feature gaps and engine-specific syntax notes are also mentioned.

### Pros

- Handy tool for testing regexes with clear visual feedback
- Easy to use with a simple interface and the ability to store and test patterns plus sample text
- Supports group highlighting to visualize matches
- Keyboard aids for editing expressions

### Cons

- Frequent crashes and overall instability
- Dark mode issues: unreadable text and invisible UI elements
- Saving/loading glitches and occasional data inconsistencies
- Navigation problems (difficulty exiting a custom RegEx back to the main menu)

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Source: [Chrome-Stats](https://chrome-stats.com/d/id894169288)