Regex Tester

Test your regular expressions against a string.

Regular Expression

Regex Pattern

Flags

Test String

Result (9 matches)

The quick brown fox jumps over the lazy dog.

What is Regex?

A regular expression (or regex) is a sequence of characters that specifies a search pattern in text. They are a powerful tool used in programming and text editing to find, replace, and validate strings. This tool provides a live environment to test your regex patterns against a sample text, showing you exactly what parts of the text your pattern matches in real-time.

Flags: g (global) finds all matches, not just the first. i (ignore case) makes the pattern case-insensitive. m (multiline) allows ^ and $ to match the start and end of lines, not just the whole string.

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