Blue highlights character classes (\d, \w), Yellow shows quantifiers (*, +, ?), Green indicates capture groups, Orange marks anchors (^, $), Purple highlights special characters, and Gray represents literal text.

It handles most common regex patterns including lookaheads, groups, and character classes. Some very advanced features like complex lookbehinds or Unicode properties may have limited visualization support.

Character classes like \d (digits 0-9), \w (word chars a-z, A-Z, 0-9, _), or [abc] (any of a, b, or c) define sets of characters that can match at a position.

Enter test text with multiple instances of your pattern. When using the global flag (g), the visualizer will highlight all matches throughout the text.