developer

Regex Tester

Test and live-debug regular expressions against sample text. Highlights all matches and capture groups.

Pattern

Flags

Test text

alice@example.com
bob@smith.co
not-an-email
charlie@dev.io

Highlighted matches (3)

alice@example.com
bob@smith.co
not-an-email
charlie@dev.io

Match #10–17

alice@example.com

Groups: $1=alice, $2=example, $3=com

Match #218–30

bob@smith.co

Groups: $1=bob, $2=smith, $3=co

Match #344–58

charlie@dev.io

Groups: $1=charlie, $2=dev, $3=io

How to use Regex Tester

1Paste your input in the panel above or use the example data if available.
2Choose an action — format, generate, convert, encode, or analyze.
3Your result appears instantly. Use Copy to grab it, or Download if a file option is shown.

Runs entirely in your browser

Nothing you type, paste, generate, or upload leaves your device.

Which flavor of regex?

JavaScript regex compliant since it runs natively in your browser.

Format and validate JSON instantly.

Generate MD5, SHA-1, SHA-256 hashes.