v1.2 · Stable · Free personal · Paid business

Modern regex workbench for every platform

Test, replace, GREP, compare, debug, export, and generate code across .NET, PCRE2, JavaScript, and a dozen more flavors — with live highlighting, a flavor-aware token palette, and portable desktop builds for Windows, macOS, and Linux.

Download latest Pricing Documentation

Free for personal use · Business license available · Self-contained zips · .NET 10 + Avalonia 12

RegexCraft Match mode showing pattern editor, analysis tree, and highlighted matches

Everything you need to craft regexes

A single desktop app for exploration, debugging, and production-ready patterns — not just a web playground.

Live Match & Groups

Subject highlighting for matches and capture groups, expandable equal-width match cards, and one-click copy or jump.

Replace & Split

Live preview with substitution highlighting and familiar backreferences — $1, ${name}, and more.

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Multi-flavor testing

.NET, PCRE2, JavaScript (Jint), plus High/Approximate flavors for Python, Java, PHP, Ruby, Go, Rust, and others.

Compare mode

Side-by-side results for 2–4 flavors: validity, matches, groups, fidelity badges, known differences, and a copyable summary.

Debug step-through

Educational walk-through for the .NET engine — F10/F11, pattern and subject focus, captures, and clear messaging when unavailable.

GREP across files

Search and replace over folders with include/exclude globs, async progress, cancellation, dry-run, and backups.

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Code generation

Emit ready-to-paste snippets for C#, JavaScript, TypeScript, Python, PHP, Java, Go, Rust, Ruby, Perl, Kotlin, and Swift.

Library & History

Twenty built-in common patterns plus your saves, categories, tags, favorites, and searchable history — persisted locally.

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Export matches

Export Test results to CSV or JSON — match index, value, offsets, groups, pattern, flavor, and options.

See it in action

Light and dark themes, professional syntax highlighting, and modes for every workflow.

Match mode in dark theme — Match mode — dark theme

Compare mode with multi-flavor cards — Compare — multi-flavor side-by-side

Generate mode producing C# code — Generate — language-aware code snippets

GREP mode searching files — GREP — folder search & replace

Replace mode with live preview — Replace — live substitution preview

Library sidebar with built-in patterns — Library — built-ins and your patterns

Engines & fidelity

Three real engines back a full flavor registry. Full / High / Approximate banners keep honesty front and center.

Flavor	Engine	Fidelity
.NET	dotnet	Full
PCRE2	pcre2	Full
JavaScript / TypeScript	javascript (Jint)	Full
PHP	pcre2	High
Python, Java, Kotlin, Swift	dotnet	Approximate
Go, Rust	dotnet	Approximate (RE2 limits modeled)
Ruby, Perl	pcre2	Approximate

Details and option matrices: Flavors guide

Ready to try RegexCraft?

Portable builds for Windows, macOS (Intel & Apple Silicon), and Linux. Free for personal use.

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