Regex Tester

Regex Tester brings together 6 capabilities, including real-time matching, capture groups, and flag support, in a single browser-based workspace. No installs, no sign-ups, no data leaving your machine. Every operation runs locally, so your files stay private by default.

Rune built Regex Tester for anyone who values getting things done over navigating menus and settings. View and inspect capture groups, named groups, and their values for each match. It is the kind of tool you bookmark once and reach for whenever the need comes up.

The first step is straightforward: Enter your regular expression pattern in the regex input field. Regex Tester is built to accept input right away, so you spend your time on the actual task rather than navigating settings panels.

Once your input is ready, add test string. Paste or type the text you want to test your regex against. Results appear in real time, giving you immediate feedback before you commit to a final output.

Finally, see matches. View highlighted matches, capture groups, and match details in real-time. The entire process from start to finish typically takes under a minute for most inputs.

For the best experience, keep these points in mind: Use non-capturing groups (?:...) when you need grouping but don't need to capture the value. Enable the 'g' flag to find all matches, not just the first one. Small adjustments like these can make a noticeable difference in your output quality.