Regex Tester
Test regular expressions
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How to use Regex Tester
- Type your regular expression and set any flags (global, case-insensitive, multiline).
- Paste sample text below — matches highlight live as you type.
- 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.