Regex Tester

Write a pattern, set flags, and instantly see matches with indexes and groups against your test string. Test regular expressions with live match lists and captu

Introduction

Regex Tester is a free, browser-based utility in our Regex Tools collection. Write a pattern, set flags, and instantly see matches with indexes and groups against your test string. Regex Tester lets you experiment with JavaScript regular expressions in the browser. Inspect global matches, capture groups, and flag combinations without leaving your workflow. Everything runs locally in your browser — inputs stay on your device, with no account or upload required. Highlights include live match listing.

Features

Live match listing
Capture group display
Flag helpers for i and m
Copy matches

How to use

1
Enter a regex pattern and optional flags.
2
Paste text to test against.
3
Review matches and groups below.

Example

Email-like tokens

Input

\b\w+@\w+\.\w+\b

Output

ada@example.com

Benefits

Run Regex Tester entirely in the browser with no signup or installation.
Keep sensitive sample data private — processing never leaves your device.
Live match listing
Capture group display
Flag helpers for i and m
Pair it with Find & Replace and Email Validator when your workflow needs adjacent utilities.

FAQs

The browser’s JavaScript RegExp engine.

Use g to collect all matches. Without g, only the first match is shown.

No. Testing is local.

Yes. Regex Tester on EverydayDevTools is free, with no account, watermarks, or usage caps for normal interactive use.

No. Regex Tester runs in your browser. Your input is processed locally and is not sent to EverydayDevTools servers.

Write a pattern, set flags, and instantly see matches with indexes and groups against your test string. It fits everyday regex tools tasks when you want a fast local utility instead of installing a CLI or opening a heavy IDE feature.

Core capabilities include: Live match listing; Capture group display; Flag helpers for i and m; Copy matches.

Developers often pair Regex Tester with Find & Replace, Email Validator, Text Diff. Open Related tools on this page for quick links.