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Regex Tester & Highlighter

Test your regular expressions in real-time. Instantly see your matches, manage JS Regex flags, and validate syntax.

Expression

Write your regular expression underneath

Regular Expression

Valid Expression

Common Flags

g (Global) - Match all occurrences

i (Case Insensitive) - Ignore capitalization

m (Multiline) - Make ^ and $ match line boundaries

Test String

5 matches found

Highlight Preview

Hello world! This is a Regex tester where we Match Capitalized words.