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Regex Tester

Test and debug JavaScript regular expressions online. Our Regex Tester highlights matches in real-time against your sample text, helping you verify patterns quickly.

//

Matches (9)

Match 1Index: 1 to 3
he
Group 1:he
Match 2Index: 4 to 9
quick
Group 1:quick
Match 3Index: 10 to 15
brown
Group 1:brown
Match 4Index: 16 to 19
fox
Group 1:fox
Match 5Index: 20 to 25
jumps
Group 1:jumps
Match 6Index: 26 to 30
over
Group 1:over
Match 7Index: 31 to 34
the
Group 1:the
Match 8Index: 35 to 39
lazy
Group 1:lazy
Match 9Index: 40 to 43
dog
Group 1:dog

About the Regular Expression Tester

The Regex Tester by Coders Kit is an interactive tool to learn, build, and test Regular Expressions (RegEx) in real-time. RegEx is a powerful sequence of characters that specifies a search pattern, used for string searching (find) and manipulation (replace). Our tool highlights matches instantly as you type, helping you debut complex patterns.

Regex Features

Real-time Highlighting

Paste your text and type your pattern. We visually highlight every match in the text, so you can see exactly what your regex is capturing (and what it is missing).

JavaScript Flavor

We use the standard JavaScript RegExp engine. This ensures that the patterns you test here will work perfectly in your Node.js apps or frontend browser code.

Flags Support

Toggle common flags like g (global search), i (case insensitive), and m (multiline) to refine how your pattern matches against the text.

Common Regex Patterns

  • Email: ^[\w-\.]+@([\w-]+\.)+[\w-]{2, 4}$ - Validates standard email formats.
  • Date (YYYY-MM-DD): ^\d4-\d2-\d2$ - Matches standard ISO date format.
  • Alphanumeric: ^[a-zA-Z0-9]+$ - Matches only letters and numbers.