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Regex Tester

Test regular expressions in real-time with match highlighting.

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What is Regex Tester?

The Free Regex Tester tests regular expressions in real-time with match highlighting. See matches as you type, capture groups, and flags. Supports JavaScript and PCRE regex syntax. Perfect for developers and data engineers.

How to Use Regex Tester

  1. [1]Enter your regular expression pattern
  2. [2]Type or paste the text to test against
  3. [3]View real-time matches highlighted in the test text
  4. [4]Copy the working regex for use in your code

Common Use Cases

  • ▸Developers building form validation
  • ▸Data engineers writing data extraction patterns
  • ▸QA engineers crafting log analysis queries
  • ▸Students learning regular expressions
  • ▸Anyone needing to test and debug regex patterns

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▸JSON Formatter Validator▸SQL Formatter▸Keyword Density Checker▸Meta Tag Preview▸API Response Mock Generator
Built byDhanu Decodes·Free forever, no sign-up required·Last updated June 2026

Frequently Asked Questions

How do I test regular expressions online?
Enter your regex pattern between slashes, set flags (g, i, m, s, u), and type test text. The tool shows all matches with position and length in real-time.
What regex flags are available?
Global (g) finds all matches, Ignore Case (i) makes matching case-insensitive, Multiline (m) anchors work on lines, Dot All (s) makes dot match newlines, Unicode (u) enables full Unicode matching.
Is this regex tester free?
Yes, completely free with real-time matching. Great for debugging regex patterns before using them in code.

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