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Regex Tester & Debugger

Write regex, see matches instantly. Capture groups highlighted, common patterns one click away, and support for JavaScript, Python, and Go regex flavors.

100% Free · No limits

Regex Tester
& Debugger

Test regular expressions in real-time with match highlighting, capture groups, and replace mode. All client-side, nothing sent to a server.

Presets:
PATTERN
//g
Flags:global
TEST STRING
HIGHLIGHTED MATCHES
Matches will be highlighted here
Live Testing
See matches highlighted instantly as you type. Global, case-insensitive, multiline, and dotall flags supported.
Capture Groups
View numbered and named capture groups for each match. Debug complex patterns with full group breakdowns.
100% Client-Side
Your data never leaves your browser. No server calls, no logging, no tracking. Completely private.

How to Test Regular Expressions

Write and debug regex patterns in real-time with The IT Hustle's free Regex Tester.

  1. 1
    Enter your regex patternType your regular expression in the pattern input field at the top.
  2. 2
    Add test stringsEnter one or more test strings in the text area below to match against your pattern.
  3. 3
    View matches in real-timeMatches are highlighted instantly as you type. Capture groups are shown separately with their values.

Frequently Asked Questions

The tester supports JavaScript, Python, and Go regex flavors. Select your flavor from the dropdown to ensure your pattern works correctly in your target language.

Yes. Named and numbered capture groups are displayed with their matched values, making it easy to debug complex patterns.

Yes. The tool includes a library of common patterns for emails, URLs, phone numbers, dates, and more that you can use as starting points.

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