Question 1

What is a regular expression?

Accepted Answer

A regular expression (regex) is a pattern used to match character combinations in strings.

Question 2

Are my patterns stored?

Accepted Answer

No. Everything runs in your browser. Nothing is uploaded.

Question 3

How do I check online free?

Accepted Answer

Enter your input above and get an instant result. Free with no sign-up, works on mobile and desktop.

Question 4

What does it check?

Accepted Answer

It validates your input against standard rules instantly. Enter the value above to see the result.

Question 5

Is my data kept private?

Accepted Answer

Yes. Everything runs in your browser. Nothing you enter is uploaded or stored.

Question 6

Is this Regex Tester free?

Accepted Answer

Yes, completely free with no sign-up. Use it unlimited times online on any device.