Regex Tester

Test regular expressions

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How to use Regex Tester

  1. Type your regular expression and set any flags (global, case-insensitive, multiline).
  2. Paste sample text below — matches highlight live as you type.
  3. Iterate on the pattern until it matches exactly what you intend, nothing more and nothing less.

About this tool

Regex Tester is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.

Category: Developer Tools. Browse more Developer Tools tools.