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Regex Tester
Test regular expressions with live match highlighting. 8 presets for common patterns, flag toggles, and match details.
🧪 Pattern
//
📋 Presets
🎯 Matches (0)
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What are regular expressions used for?
Regular expressions (regex) are patterns used to match, find, and manipulate text. Common uses: validating email addresses, extracting phone numbers from text, searching logs, and find-and-replace operations.
What do the regex flags (g, i, m, s) mean?
g (global) finds all matches. i (case-insensitive) ignores uppercase/lowercase. m (multiline) makes ^ and $ match line starts/ends. s (dotAll) makes . match newlines.