Regex Tester

Test regular expressions with live pattern matching and match highlighting. Perfect for debugging regex patterns and learning regex syntax.

Regular Expression Pattern

Flags

g (global) i (case-insensitive) m (multiline)

Test Text

Regex Tester FAQ

What is a regular expression (regex)?

A regular expression is a sequence of characters that defines a search pattern. It's used for pattern matching, text validation, find and replace operations, and data extraction from strings.

What do the regex flags mean?

Common regex flags include: g (global - find all matches), i (case-insensitive), m (multiline - ^ and $ match line breaks), s (dotAll - dot matches newlines), and u (unicode support).

How do I test my regex pattern?

Enter your regex pattern in the pattern field, add your test text, select appropriate flags, and click Test. Matches will be highlighted and details shown below.

What are common regex metacharacters?

Common metacharacters include: . (any character), * (0 or more), + (1 or more), ? (0 or 1), [] (character class), () (capture group), | (alternation), ^ (start), $ (end), and \\ (escape).

Can I save my regex patterns?

This tool runs entirely in your browser and doesn't save patterns. Copy your working patterns to your code editor or save them in a text file for future use.

Is my regex data secure?

Yes, all regex testing happens entirely in your browser. Your patterns and test text never leave your device or get sent to any server.