Which regex syntax is supported?

This tool uses JavaScript regular expressions (ECMAScript). It supports all standard features including character classes, quantifiers, lookahead/lookbehind, named groups, and Unicode properties.

What regex flags are available?

g (global), i (case-insensitive), m (multiline), s (dotAll), u (unicode). You can combine flags freely.

How do capture groups work?

Parentheses in the pattern create capture groups. The tool shows each group value for every match. Named groups (? ...) are also supported.

Regex Tester

Test regular expressions against text with real-time match highlighting.

Pattern

$Test String

lines

0 chars1 lines

0 matches found

Related Tools

AaCase Converter

Convert text between UPPER, lower, Title, camelCase, snake_case, and more.

WcWord Counter

Count words, characters, sentences, and lines in any text.

FAQ

Which regex syntax is supported?: This tool uses JavaScript regular expressions (ECMAScript). It supports all standard features including character classes, quantifiers, lookahead/lookbehind, named groups, and Unicode properties.
What regex flags are available?: g (global), i (case-insensitive), m (multiline), s (dotAll), u (unicode). You can combine flags freely.
How do capture groups work?: Parentheses in the pattern create capture groups. The tool shows each group value for every match. Named groups (?<name>...) are also supported.

The Regex Tester lets you write and test regular expressions against sample text in real time. It highlights all matches, shows capture groups, and displays match details. Supports all JavaScript regex flags (g, i, m, s, u). Essential for developing and debugging regex patterns.