Text tools for daily development
Regular expressions power validation, parsing, and search across virtually every codebase. Markdown drives README files, documentation sites, and issue trackers. These text tools give you instant feedback without installing extensions or switching to a separate desktop app.
Regex tester
The Regex Tester shows matches, capture groups, and flags in real time as you type. Test patterns for email validation, log parsing, URL extraction, or refactor-safe search-and-replace before applying them in production code. Supports common flags including global, case-insensitive, and multiline.
Markdown previewer
Write or paste Markdown and see rendered output with GitHub Flavored Markdown support — tables, task lists, strikethrough, and fenced code blocks. Perfect for drafting README sections, release notes, or documentation before pushing to your repo.
Private by design
Regex patterns and Markdown drafts may contain proprietary business logic, internal URLs, or unreleased feature descriptions. Because these tools run client-side, your content stays on your machine throughout editing and preview.