How do I test a regex pattern?

Enter your pattern and sample text above. Matches are highlighted live and capture groups are shown, so you can see exactly what the regex does.

Which regex flags are supported?

Common flags including global, case-insensitive, and multiline are available, matching JavaScript regular expression behavior.

Is my test text uploaded?

No. Matching runs entirely in your browser.

All tools/Data Inspector

Regex Tester

Runs locally

Test regular expressions securely against strings using native browser APIs. Data never leaves your device.

Regular Expression

Flags

Global

Don't return after first match

Case Insensitive

Case insensitive match

Multiline

^ and $ match start/end of line

Dot All

Dot matches newline

Test String

Match Results

5 matches

Match 1

Index: 0

Full Match

Hello

Capture Groups

Match 2

Index: 6

Full Match

World

Capture Groups

Match 3

Index: 13

Full Match

This

Capture Groups

Match 4

Index: 23

Full Match

Regex

Capture Groups

Match 5

Index: 29

Full Match

Tester

Capture Groups

Test and debug regular expressions against your own text with live, highlighted matches. See capture groups, try flags, and refine your pattern until it's right — all in your browser. A fast way to build and verify regex without guessing.

How to test a regular expression

1Enter your regex pattern and choose flags (global, case-insensitive, multiline).
2Paste the text to test against — matches highlight as you type.
3Inspect capture groups and adjust the pattern until it matches correctly.

Build patterns with instant feedback

Regular expressions are powerful but easy to get subtly wrong. Testing a pattern against real sample text with live highlighting shows immediately what it matches and misses, including each capture group, so you can iterate to a correct pattern in seconds instead of debugging it in code.

Frequently asked questions

How do I test a regex pattern?: Enter your pattern and sample text above. Matches are highlighted live and capture groups are shown, so you can see exactly what the regex does.
Which regex flags are supported?: Common flags including global, case-insensitive, and multiline are available, matching JavaScript regular expression behavior.
Is my test text uploaded?: No. Matching runs entirely in your browser.