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REGEX TESTER & BUILDER

Test, build, and learn regular expressions with live highlighting, match groups, replace functionality, and visual explanations. Perfect for developers.

⭐ 4.9 RATING

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[ WHY USE THIS TOOL? ]

> Live regex testing with real-time highlighting of matches

> Visual explanation of regex patterns character by character

> Match groups visualization and extraction

> Replace functionality with live preview

> 20+ common regex patterns library ready to use

> Pattern history to save and reuse your regex

> Multiple test strings support for comprehensive testing

> All regex flags (global, case-insensitive, multiline, etc.)

[ POWERFUL FEATURES ]

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LIVE TESTING

Test your regex patterns in real-time as you type. See matches highlighted instantly with color-coded groups.

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MATCH GROUPS

Visualize and extract capturing groups. See position, length, and content of each match and group.

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REPLACE FUNCTION

Test string replacement with regex. Use $1, $2 for groups. See results instantly before copying.

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PATTERN LIBRARY

20+ common regex patterns including email, URL, phone, date, credit card, and more. Click to load instantly.

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VISUAL EXPLANATION

Learn regex by seeing character-by-character explanations. Understand what each part of your pattern does.

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PATTERN HISTORY

Save your regex patterns to history. Quickly reload previous patterns with one click.

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REGEX FLAGS

Toggle all regex flags: global (g), case-insensitive (i), multiline (m), dotall (s), unicode (u), sticky (y).

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MATCH STATISTICS

See total matches, groups, and execution time. Track performance and verify your regex efficiency.

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MULTIPLE TEST STRINGS

Test your regex against multiple strings simultaneously. Perfect for validating patterns across different inputs.

[ HOW TO USE ]

1. Enter your regex pattern in the "Regex Pattern" field (without the forward slashes)

2. Add test strings in the "Test String" field(s). Click "+ Add" to test against multiple strings

3. Toggle regex flags (g, i, m, s, u, y) as needed for your use case

4. View matches highlighted in real-time with match details and groups

5. Use the "Replace" section to test string replacement with $1, $2 for groups

6. Browse the Pattern Library to load common regex patterns instantly

7. Save patterns to History for quick access later

8. Check the Explanation panel to understand what each part of your regex does

[ READY TO TEST YOUR REGEX? ]

Start testing and building regular expressions now. No signup required. Free forever.

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