Regex Pattern Inspector

Tokenize a JavaScript regex pattern for structural inspection without claiming to be a complete ECMAScript parser or debugger.

Pattern source

Flags for syntax check

—Groups

—Captures

—Character classes

—Quantifiers

ReadyThis is a structural tokenizer for common JavaScript regex constructs, not a complete ECMAScript grammar parser.

How to use this Regex Pattern Inspector

Inspect regex groups, classes, quantifiers, anchors, escapes, and syntax validity. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.