skefo
All tools

Regex Tester

Test regular expressions and inspect matches and groups.

Text

Test a JavaScript regular expression against sample text. Matches always run globally.

Matches
Output appears here.

Regex Tester is part of skefo, a collection of 58 developer and pentester utilities that run entirely in your browser. Test regular expressions and inspect matches and groups. No data is ever uploaded to a server.

More Text tools

Large CSV Viewer

Browse, sort and regex-filter huge CSV files locally with paging.

JSON Formatter

Validate, pretty-print and minify JSON.

Case Converter

camelCase, snake_case, kebab-case, Title Case and more.

Line Tools

Sort, deduplicate, reverse, shuffle and count lines.

Text Diff

Line-by-line comparison of two blocks of text.

Unicode Inspector

Reveal code points and spot homoglyphs and invisible characters.

Cron Describer

Break down a cron expression field by field.

Text Statistics

Character, word, line counts and reading time.