Question 1

Which regex flavour is supported?

Accepted Answer

This tool uses JavaScript's built-in RegExp engine, which supports most common regex features: character classes, quantifiers, groups, lookaheads, lookbehinds, named groups, and Unicode.

Question 2

What do the flags do?

Accepted Answer

g = global (find all matches), i = case insensitive, m = multiline (^ and $ match line boundaries), s = dotAll (. matches newlines), u = Unicode mode.

Question 3

What are capture groups?

Accepted Answer

Groups enclosed in parentheses () capture the matched text. Named groups use the syntax (?<name>...). This tool shows all groups for each match.

Regex Tester

Frequently Asked Questions

Regex Tester

Frequently Asked Questions

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