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.

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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.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    The developer has not yet indicated which accessibility features this app supports. Learn More

    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.
    Languages
    English and 7 more
    • English, French, Italian, Japanese, Russian, Simplified Chinese, Spanish, Traditional Chinese
    Age Rating
    4+
    Copyright
    • © 2026 Antoine Jacono