Welcome to Regex Tester Pro

📌 Pin the extension

1

Click the puzzle 🧩 in your toolbar

The Extensions menu opens.

2

Find Regex Tester Pro

Click the pin icon next to its name.

3

Click the Regex Tester Pro icon

The popup opens. You're ready to test patterns.

⚡ Try it in 30 seconds

Open the popup, paste this pattern and test text, then watch matches light up:

Pattern

/\b\w+@(\w+\.)+\w+\b/ gi

Test string

Reach sarah@acme.io for billing,
dwright@stripe.com for partnerships,
cc: mira@payments.dev

💌 Get the regex playbook (optional)

Four short emails over the next two weeks: the patterns senior engineers reach for, the ReDoS bugs to dodge, and a few quiet workflow tricks for the popup. No spam, unsubscribe in one click.

We use SendSimple, our own mailing tool. Your address stays with us.

✓ Subscribed. The first email is on its way.

🔓 What Pro unlocks

Free is generous: 100 tests/day, all flags, 5 starter patterns, history of last 5 tests. Pro is for the engineers who debug 50 patterns a day:

Step-by-step pattern explainer - the AST walker breaks any pattern into plain English
50+ pre-built pattern library - email, URL, IP, UUID, JWT, AWS keys, GitHub tokens, and more
Catastrophic backtracking detection - catch ReDoS bugs before they ship
Unlimited saved patterns, last 100 tests in history, full searchable cheatsheet
Export test cases - save your pattern + inputs + matches as a Jest/Vitest/Mocha file