RegEx Knife

Name: RegEx Knife
Rating: 4.3 (25 reviews)
Author: Mark Alldritt

By: Mark Alldritt

Utilities

Features & Capabilities

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.

User Growth & Download Statistics

App

By:

Mark Alldritt

Rating:

4.30

(25) 4.30

Version:

2.0.2 Last updated: 2020-09-10

Version code:

834563504

Creation date:

2014-07-20

Compatible devices:

Size:

3.71MB

URLs:

Website ,Privacy policy

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-06-12

Compare stats and ranking:

Ranking

# 265,215 ▲ 891,117

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

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Developed by:

Mark Alldritt

Apple Apps Store

https://apps.apple.com/us/app/regex-knife/id894169288

Website:

http://markalldritt.com/?page_id=800

User Reviews

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)

Recent reviews

This app has been useful, but recently I can’t exit from a custom RegEx back to the main menu. I’m guessing the app needs to be updated. Otherwise I’d give this a much higher star rating.