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ToolsDeveloperRegex Tester

Regex Tester

Test and debug regular expressions with live match highlighting.

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How to use Regex Tester

  1. 1Enter your regular expression in the pattern field.
  2. 2Toggle flags — g (global), i (case-insensitive), m (multiline), s (dotAll) — as needed.
  3. 3Type or paste test text in the test string area — matches highlight automatically.
  4. 4Use replace mode to preview substitutions without leaving the browser.