a8s Regex
Test your regex offline
$2.99
Create and test regular expressions with highlighted matches, capture groups, replacements, test cases and favorites at your fingertips.
Create, test and refine regular expressions on Mac, iPhone, iPad and Apple Vision Pro. a8s Regex highlights matches in your text and helps you understand each result.
TEST AND EXPLORE
• Highlighted matches and detailed capture groups.
• Replacement previews using $1, $2 and subsequent groups.
• Examples for extracting email addresses, parsing logs and reformatting dates.
• Up to 50 positive or negative test cases, saved with your pattern.
KEEP YOUR WORK
Save patterns to history, mark favorites and return to your last session. Export results as JSON or CSV. History stays on each device, with no automatic synchronization.
A PRECISE ENGINE
The app uses NSRegularExpression, Foundation’s ICU engine. Its syntax may differ from JavaScript, PCRE or Python. Positions use UTF-16 units.
ON YOUR DEVICE
Local processing, with no account, advertising or tracking. One-time purchase, no subscription.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The interface is available in French, English, Japanese, Simplified and Traditional Chinese, Russian, Italian and Spanish. Large exports are bounded, saving while typing is improved, and matches remain available if replacement fails. Oversized sessions are preserved for recovery. Long option labels can wrap across lines.
The developer, Antoine Jacono, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Antoine Jacono
- Size
- 10.4 MB
- Category
- Developer Tools
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 7 more
- English, French, Italian, Japanese, Russian, Simplified Chinese, Spanish, Traditional Chinese
- Age Rating
4+
- 4+
- Copyright
- © 2026 Antoine Jacono

