Test and debug regular expressions with real-time matching, group capture, and detailed explanations.
Type your regular expression.
Enter text to test against.
View highlighted matches and capture groups.
Use the Regex Tester when building or debugging regular expressions for form validation, log parsing, data extraction, or text processing. It is indispensable when developing search-and-replace patterns for code refactoring or text manipulation. Backend developers use it to test patterns for URL routing, input validation, and parsing structured data like emails, phone numbers, and dates.
The tool uses JavaScript (ECMAScript) regular expressions, which are the standard for web development and Node.js applications. This includes support for lookahead, lookbehind (ES2018+), named capture groups, and Unicode property escapes. Patterns written here will work directly in JavaScript, TypeScript, and most modern programming languages with compatible regex engines.
All standard JavaScript regex flags are supported: global (g) for multiple matches, case-insensitive (i) for ignoring letter case, multiline (m) for treating each line as a separate string boundary, dotAll (s) for matching newlines with dot, unicode (u) for full Unicode support, and sticky (y) for matching at exact positions.
Yes, all capture groups are displayed in detail — both numbered groups (parentheses) and named groups (?<name>...) are shown with their matched content and position. This makes it easy to build and debug complex extraction patterns for parsing structured text, log files, and data strings.
Read our complete guide on how to use Regex Tester effectively.
