Regex Tester

How to Use:

• Enter a regular expression pattern
• Add test text to match against
• Select regex flags (g, i, m, s, u, y)
• View matches and their positions
• Use common patterns for quick testing

Regex Flags:

• g: Global - find all matches
• i: Case insensitive
• m: Multiline - ^ and $ match line boundaries
• s: Dotall - . matches newlines
• u: Unicode - handle Unicode properly
• y: Sticky - match only at lastIndex

What regex syntax does this tool support?

This tool supports JavaScript regex syntax, which is based on ECMAScript. It includes most common regex features like character classes, quantifiers, and groups.

How do I escape special characters?

Use backslashes to escape special regex characters. For example, to match a literal dot, use \. instead of .

What's the difference between the flags?

Flags modify how the regex behaves. 'g' finds all matches, 'i' makes it case-insensitive, 'm' makes ^ and $ match line boundaries, and 's' makes . match newlines.

Can I test complex regex patterns?

Yes! The tool supports complex patterns including lookaheads, lookbehinds, named groups, and other advanced features. However, some features may have browser compatibility limitations.