RegExr

RegExr is an online utility designed to help developers learn, construct, and test regular expressions. It supports both JavaScript and PHP/PCRE expression flavors, providing instant visual feedback with real-time updates as you type. Users can hover over matches to inspect detailed explanations, build comprehensive test suites to validate patterns, explore built-in references, and share expressions with the community. The application also includes support for pattern saving, history management, and custom tooling to analyze results effectively.