Regex Tester

Test regular expressions with live, highlighted match feedback.

pattern

Examples:

Flags

test-string.txt

81chars2lines

matches

2 matches

Contact us at hello@example.com or support@test.com
For more info visit our site.

2matches/g
2groups

Match groupsshowing 2 of 2

#1[14–30]hello@example.com$1 hello$2 example

#2[35–50]support@test.com$1 support$2 test

Share this result

How to use Regex Tester

Enter your regular expression in the Pattern field (without surrounding slashes).
Toggle the flag chips: g for all matches, i for case-insensitive, m for multiline.
Type or paste your test string — matches are highlighted in real time.
The Match groups panel shows position, matched text, and capture groups for each match.
Use the quick-example chips to load common patterns, or open the cheat-sheet for a syntax reference.

Format, validate, and beautify JSON data instantly.

Decode and inspect JSON Web Tokens (JWT) online.

Minify and compress CSS code online.

Format, validate, and beautify JSON data instantly.

Encode and decode Base64 strings online.

Encode and decode URLs and query strings.

Convert colors between HEX, RGB, HSL, and HSV color models.

Rate this tool:

Was this tool helpful?