Regex Shuttle vs RegexCraft

Regex Shuttle is a free browser-based tool for testing, explaining, and learning regular expressions. As users type, it highlights matches and displays match details, groups, and indices. Its explainer separates expressions into tokens and gives plain-English descriptions, while a library provides ready-to-use patterns to copy or open in the tester. A cheat sheet covers regex characters, quantifiers, anchors, groups, and flags. The tool can preview find-and-replace results in real time, including capture-group references such as $1 and $2. It uses JavaScript's built-in RegExp engine, so its behavior follows JavaScript regex behavior in browsers and Node.js. The maker says it supports capturing groups, lookahead and lookbehind assertions, named groups, and Unicode patterns. Regex processing occurs locally in the browser; patterns and test strings are not uploaded, collected, or shared with third parties. The maker says it continues working offline after its first load. No signup or email is required, and the interface is available in English and Chinese. The Free plan is free, with no limits or ads.

RegexCraft is a desktop workbench for testing, replacing, comparing, debugging, and generating regular expressions. It supports .NET, PCRE2, and JavaScript with full fidelity; other listed flavors have High or Approximate fidelity. Match mode highlights matches and capture groups, while Replace mode previews substitutions and supports backreferences. Compare mode puts results from two to four flavors side by side, showing validity, matches, groups, fidelity, and known differences. Its educational step-through walkthrough covers the .NET engine using F10 and F11. A GREP tool searches and replaces across folders with include and exclude globs, cancellation, dry-run, and backups. It can generate code snippets for languages including C#, JavaScript, Python, Go, and Swift. Library, history, and settings stay in the operating system's application-data folder; the core product has no account system or cloud sync. Personal use is free. Commercial, organizational, government, or revenue-generating use requires a $49.00 USD one-time Business license.