RegexCraft vs RegexPlanet

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.

RegexPlanet is a free web service for testing regular expressions during development. It offers separate test pages for engines including Java, Python, Bun, Go, Deno, Erlang, Haskell, MySQL, .NET, Node.js, Perl, PHP, PostgreSQL, Ruby, Rust, Swift, Tcl, XRegExp, and the browser. The Java tester accepts a pattern, replacement, and multiple input strings, with a control for adding more inputs. Options include case-insensitive matching, multiline mode, and Unicode-aware case folding. The home page provides a field for share codes, and the site directs users to Regex Zone for sharing expressions and finding patterns. A status page reports engine status and says each engine runs separately. RegexPlanet warns that malformed expressions may run indefinitely and that some engines or hosts may face denial-of-service attacks. Its privacy policy describes collection of IP addresses, browser data, and form entries; raw logs are stored by Google CloudRun. The service is offered as-is and as-available.