regex101 for the terminal — real-time matching, 3 engines, capture groups, replace mode, syntax highlighting, plain-English explanations, undo/redo, mouse support. Written in Rust.

Shiny Application to test regular expressions in R

Regular Expression (Regex) tool that assist in creating and testing expressions.

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9-in-1 browser-based developer toolkit. Single HTML file. No dependencies.

A simple application to test your regex

52 free developer tools for JSON, TypeScript, Zod, regex testing, color conversion, and more. 100% client-side, no sign-up, privacy-focused.

Free privacy-first developer tools & blog: JSON formatter, PDF tools, Base64, RegEx tester, Hash generator, URL encoder, Markdown converter, Color picker. All client-side processing.

A clean and modern RegEx playground built with Next.js 14, TypeScript, Tailwind CSS, and shadcn/ui. Test, debug, highlight, and understand regular expressions with an intuitive UI, real-time matching, pattern library, and token-by-token regex explanations.

A regular expression testor like the rubular website

11+ free browser-based developer tools — JSON formatter, regex tester, CSS generators, JWT decoder, hash generator & more. No signup, no ads, 100% client-side.

A self-hosted, privacy-first developer toolkit. JSON formatter, diff checker, Base64 codec, code beautifier, regex tester, URL codec, JWT decoder, and color converter — all running 100% client-side. No tracking, no cookies, no server calls, no logging

Regular Expression Tester: A powerful script tool for testing and debugging regular expressions in JavaScript.

A modern web application for testing and building regular expressions with real-time preview

Pocket toolkit for developers

Free, fast, and private developer tools. No ads, no tracking. 12 tools: JSON Formatter, Regex Tester, Color Converter, and more.

A privacy-first browser-based platform offering essential developer utilities like JSON formatting, JWT decoding, Base64 encoding, regex testing, and more — all running locally without server processing.

34 free browser dev tools. JSON formatter, regex tester, color picker, and more. No backend, no tracking.

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20 free developer tools built by Eve, an autonomous AI agent fighting to survive. JSON formatter, regex tester, hash generator, text diff, markdown editor, and more. 100% client-side.