The research shortlist
Page updated
RegExrTop pick
Mature browser-based regex workbench
Metadata checked Aug 18, 2026
Best overall functional match: mature, widely trusted, actively released, and immediately usable on macOS in a modern browser.
A polished online tester with live matches, syntax help, save/share support, community patterns, and JavaScript plus PHP/PCRE engines.
- 01Real-time match updates
- 02JavaScript and PHP/PCRE support
- 03Syntax reference and contextual explanations
- 04Save and share expressions
- 05Replace, list, details, and explain tools
- Browser-only; no native or offline macOS package.
- Engine coverage is narrower than multi-runtime testers.
Evidence sources (8)
- Official RegExr repositorySource available ·
- RegExr GPL v3 licenseLicense ·
- RegExr GitHub releasesRelease ·
- Official RegExr web appWebsite ↗ ·
- GitHub REST repository APISource available ·
- GitHub license metadataLicense ·
- Latest GitHub releaseRelease ·
- Official gskinner post describing RegExr as an online and free toolFree at review time ·
rgx
Multi-engine regex testing from the terminal
Metadata checked Aug 18, 2026
Best local developer-focused option: current releases, explicit macOS support, strong debugging features, and no browser or account dependency.
Full review — capabilities, 2 caveats, evidence
A local terminal regex workbench with live matching, AST highlighting, three engines, replacement preview, capture groups, explanations, and recipes.
- 01Live matching and syntax highlighting
- 02Rust, fancy-regex, and PCRE2 engines
- 03Capture-group and match highlighting
- 04Replace/substitution preview
- 05Plain-English explanations and cheat sheet
- 06macOS Homebrew and release installs
- Terminal UI rather than a native graphical Mac app.
- The PCRE2 engine can require its native library on some installation paths.
Evidence sources (9)
- Official rgx repositorySource available ·
- rgx MIT licenseLicense ·
- rgx Apache 2.0 licenseLicense ·
- Latest rgx releaseRelease ·
- Official rgx installerFree at review time ·
- rgx macOS and Homebrew supportDocumented macOS path ·
- rgx product demoScreenshots ·
- GitHub REST repository APISource available ·
- GitHub license metadataLicense ·
Regex Vis
Visual regex editor and tester
Metadata checked Aug 18, 2026
Closest to Expressions' visual learning workflow, with strong community adoption and active 2026 commits; its hosted-browser format limits local Mac integration.
Full review — capabilities, 2 caveats, evidence
A browser-based visualizer that turns patterns into editable diagrams and tests them interactively, making complex expressions easier to inspect.
- 01Visualize regular expressions
- 02Edit patterns through the visualization
- 03Test expressions interactively
- 04Open-source MIT implementation
- 05Hosted web deployment
- Browser-only; no native or offline macOS binary.
- The official GitHub releases page has no packaged releases; use the hosted app or build from source.
Evidence sources (9)
- Official Regex Vis repositorySource available ·
- Regex Vis active commit historySource available ·
- Regex Vis MIT licenseLicense ·
- Regex Vis GitHub releases pageRelease ·
- Official Regex Vis web appWebsite ↗ ·
- Regex Vis project iconScreenshots ·
- GitHub REST repository APISource available ·
- GitHub license metadataLicense ·
- MIT license grants free-of-charge use of the softwareFree at review time ·
Specifications, side by side
| Attribute | 1 · RegExr | 2 · rgx | 3 · Regex Vis |
|---|---|---|---|
| License | GPL-3.0-only | Apache-2.0 | MIT |
| Platforms | macOS | macOS, Windows, Linux | macOS |
| Status | Checked | Checked | Checked |
| Version | v3.6.1 | v0.14.2 | — |
| Stars | 10.3k | 233 | 4.4k |
| Last push | |||
| Caveats | 2 | 2 | 2 |
About Expressions
Expressions — Regex editor for Mac with syntax highlighting, cheatsheets, and live testing.
Setapp listing: Speed up work with regex
