TOOLSTEKNO

Regex Tester

Real-time regular expression validator and match highlighter. Test your patterns against sample data instantly.

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Match Results

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Regular Expression Tips

Use flags like g (global), i (case-insensitive), or m (multiline) to control matching behavior. Remember that all processing happens locally in your browser.

How to Use Regex Tester

  1. 1

    Enter Your Pattern

    Type your regular expression in the pattern field (without the surrounding slashes).

  2. 2

    Select Flags

    Choose flags: g (global), i (case-insensitive), m (multiline).

  3. 3

    Type Test String

    Enter text in the test string area. Matches will be highlighted in real-time.

Frequently Asked Questions

What regex flavor is used?
This tool uses JavaScript's built-in RegExp engine, which follows the ECMAScript standard.
Why is my regex not matching?
Common issues include: forgetting to escape special characters, incorrect flags, or anchors (^ and $) that don't match as expected with multiline text.
How do I match a literal dot?
Use \. to match a literal dot. Without the backslash, a dot matches any character.