Regex Tester & Match Highlighter

Test JavaScript regular expressions against sample text with real-time match highlighting, flag toggles (g, i, m, s, u), and capture group extraction.

🛡️ 100% Client-Side Privacy Guarantee: This utility executes inside your browser runtime. Zero data is transmitted to external servers.

How to Use Regex Tester & Match Highlighter

  1. Input your data or choose a sample preset in the interactive workspace.
  2. Click process or calculate to execute instant client-side evaluation.
  3. Copy or export the verified output result with one click.

Interactive Regular Expression Tester & Debugger

Validate ECMAScript regular expressions in real time, toggle flags (g, i, m, s, u), load common presets for Emails, IPv4 addresses, URLs, ISO dates, or SemVer tags, and inspect indexed capture groups in a structured table.

Frequently Asked Questions

Which regex flavor does this tester use?

It runs natively against your browser's ECMAScript (JavaScript) RegExp engine, supporting lookaheads, named/numbered capture groups, dotAll (s), and Unicode (u) flags.

Can I export matched results and capture groups?

Yes. Click Copy Matches to copy the structured JSON array of matches, offsets, and capture groups.