Debug JavaScript regexes with captures, locations, replacement previews, performance hints, and code export
g global · i ignore case · m multiline · s dotAll · u Unicode · y sticky · d indices · v Unicode sets
Running in isolation…
Matching and replacement run locally in an isolated browser Worker and are terminated after 750ms. Up to 1,000 matches are retained; performance hints are heuristic.
Debug JavaScript regexes with captures, locations, replacement previews, performance hints, and code export. It requires no desktop installation and supports common developer workflows directly in a modern browser.
Core processing runs locally in your browser. Tool input is not uploaded; downloads and clipboard actions are handled by the browser.
Continue with the next step in the same workflow.
Safely compare text by line with case and whitespace options, line statistics, and unified Patch export
Accurately count multilingual graphemes, code points, UTF-8 bytes, words, sentences, reading time, and frequencies
Convert Unicode text and developer identifiers to camel, snake, constant, dot, path, and other naming styles
Inspect zero-width characters, bidirectional controls, mixed scripts, encodings, and normalization risks