# Regex tester

Test a JavaScript regular expression against your text, see every match and group, and preview a replacement.

## How it works

Matches are highlighted as you type, named and numbered groups are listed, and the replacement shows the result straight away.

## Questions

### Which regex syntax is this?

JavaScript (ECMAScript). Most features match PCRE, .NET and Python; lookbehind and named groups are supported.

### What do the flags mean?

g finds all matches, i ignores case, m makes ^ and $ match each line, s lets . match line breaks, u enables Unicode.

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