Regex Tester
Validate, test, and match regular expressions against input texts in real-time. Review matched indexes and capture groups.
Regex Builder
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Regex Modifiers (Flags)
Interactive Highlight Preview
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Matches Found (0)
No matching substrings found.
Frequently Asked Questions
Is my data sent to a server when using the Regex Tester?
No. The Regex Tester is a fully client-side utility. All data processing, calculations, and conversions are handled locally in your browser. No input text, payloads, or keys are uploaded to any external server.
What regular expression flags are supported?
It supports standard JS regex flags including `g` (global), `i` (case-insensitive), `m` (multi-line), `u` (unicode), and `s` (dotAll).
How are capturing groups highlighted?
The tester evaluates matches dynamically, showing capturing groups and indices side-by-side for clear expression debugging.
Which regex flavor is implemented?
The regular expression parsing conforms to standard ECMAScript / JavaScript regular expression engines built directly into your browser.
Does the Regex Tester store history or cache my inputs?
No. The application runs entirely in browser memory. Once you refresh the tab, navigate away, or close the window, all inputted details, logs, and outputs are completely cleared.
Is the Regex Tester compatible with mobile devices?
Yes. The interface is optimized to be fully responsive. You can perform calculations, conversions, and formats on all modern mobile, tablet, and desktop web browsers.
Does the Regex Tester work offline?
Yes. Once loaded, all code and assets required to run the Regex Tester reside in your browser cache, enabling offline use without an active network connection.