RegExr
Online tool for learning, building and testing regular expressions
RegExr is an online tool for learning, building, and testing regular expressions. It solves the problem of writing and debugging regex patterns by providing a live editor where results update in real time as the user types. The tool supports both JavaScript and PHP/PCRE regex flavors.
Key capabilities include real-time matching with rollover details, a test suite feature for validating patterns against multiple inputs, and tools for exploring results: Replace, List, Details (which shows capture groups), and Explain (which describes the expression in plain English). A sidebar contains a cheatsheet, a full reference with examples, and help documentation. Users can save and share expressions, search and rate community patterns, and use undo/redo in the editor.
RegExr is aimed at developers and anyone learning or working with regular expressions. The tool is free to use online without requiring an account. Signing in allows users to persist favorites and patterns across sessions. No paid plans, trials, or seat-based pricing are mentioned on the provided pages.
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