Regex Tester
Test regular expressions with live highlighting. See matches, groups, and flags in real-time.
Created by Launch Arcade
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How to Use
Test and debug regular expressions (regex patterns) against sample text. • Enter your regex pattern in the "Regular Expression" field • Type or paste test text in the "Test String" textarea • Click flag buttons (g, i, m, s) to toggle regex modifiers: - g: global (find all matches) - i: case insensitive - m: multiline mode - s: dot matches newlines • Click preset buttons for common patterns like Email, URL, Phone numbers • Matches are highlighted in the output with alternating colors • Match count and positions are shown below the output • Invalid regex patterns will show error messages in red • Use this tool to validate patterns before implementing them in code