ZenovayTools

Regex Tester

Test regular expressions with real-time matching, capturing groups, and explanation.

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How to Use Regex Tester

  1. 1Enter your regular expression pattern in the regex field.
  2. 2Set flags such as global (g), case-insensitive (i), or multiline (m).
  3. 3Type or paste test text in the input area.
  4. 4View real-time highlighted matches and capturing groups.
  5. 5Copy the regex or use it directly in your code.
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Frequently Asked Questions

Is my data secure?▾
Yes, all regex matching happens in your browser. No data is sent to any server.
Which regex flavor does this use?▾
This tool uses JavaScript regular expressions (ECMAScript standard), which is the same regex engine used in modern browsers and Node.js.
What are regex flags?▾
Flags modify how the pattern is applied. g (global) finds all matches, i (case-insensitive) ignores case, m (multiline) makes ^ and $ match line boundaries, and s (dotAll) makes . match newlines.
How does this compare to Regex101 or RegExr?▾
This tool provides a lightweight, privacy-focused alternative. All matching runs in your browser with no server calls. For quick testing and validation, it covers the most common needs without the complexity of a full-featured regex IDE.
Can I see capture groups in the results?▾
Yes. When your pattern contains capture groups (parentheses), each match displays the captured group values alongside the full match and its position index in the test string.
Can I use this tool on my phone?▾
Yes, the regex tester works in any modern mobile browser. The real-time matching and highlighting work the same way on mobile devices as on desktop.
What happens with zero-length matches?▾
The tool automatically handles zero-length matches (like matching an empty string with the global flag) by advancing the index to prevent infinite loops, consistent with modern JavaScript behavior.