Question 1

What regex syntax does this tester support?

Accepted Answer

This tester uses JavaScript regex syntax (ECMAScript). It supports all standard flags including global (g), case-insensitive (i), multiline (m), and dotAll (s).

Question 2

What are capture groups?

Accepted Answer

Capture groups are parts of your pattern wrapped in parentheses (). They let you extract specific portions of a match. The results panel shows each numbered group.

Question 3

Can I use this for find and replace?

Accepted Answer

Yes — toggle the Replace mode to enter a replacement string. You can use $1, $2 etc. to reference capture groups in your replacement.

Regex Tester

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