Which regex flavor is used?

It uses the JavaScript RegExp engine in your browser (ECMAScript), supporting flags i, m, s, u, g, y.

Can I export matches?

Yes — copy matches or download a CSV with columns for the full match and capture groups.

No. Everything runs locally in your browser.

Type a pattern, flip flags, and see matches appear in real time. Extract groups, replace text, and export results.

Pattern (no slashes)

Replace with

Use $1, $2… for groups in replacement.

Text

Ready

Examples:

How do I escape characters?

Use double backslashes in the pattern field (e.g., \d, \b) since it’s a plain text input.

How many matches are shown?

Up to 500 for performance. CSV export contains all matches that the engine yields.

Why do results differ from PCRE?

JavaScript follows ECMAScript rules (e.g., no lookbehind on older browsers). Modern browsers support lookbehind; results may vary by engine.