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Regex Tester & Debugger

Test and debug regular expressions in real time with match highlighting and substitution previews.

Regex Tester & Debugger Workspace

This tool runs directly in your browser using local CPU execution. Enter your input below to process.

Regex Tester & Debugger について

Verify your regular expression patterns against test strings before using them in production code.

Regex Tester & Debugger の使い方

  1. 1Enter your regular expression pattern.
  2. 2Toggle flags like g (global), i (case insensitive), and m (multiline).
  3. 3View highlighted matches in the test text.

このツールを使う場面

  • •Writing form validation rules.
  • •Extracting data from log files.
  • •Debugging complex regex patterns.

結果に期待できること

Real-time match highlights and match group extractions.
プライバシーは100%保護されています（ローカル処理）

Regex evaluation happens inside your browser JavaScript engine. No strings are logged or uploaded.

よくある質問 (FAQ)

Which regex dialect is supported?

Standard ECMAScript (JavaScript) regular expressions.

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