Regex Tester

Test and debug regular expressions with real-time match highlighting, capture groups, replace mode, and a library of common patterns.

Regular Expression

//g

Test String

Master Regular Expressions

Regular expressions (regex) are powerful patterns used to match, search, and manipulate text. They are supported in virtually every programming language including JavaScript, Python, Java, Go, and more.

This free regex tester lets you write and test regular expressions with real-time match highlighting, capture group extraction, and a replace mode for string transformations. The common patterns library gives you instant access to pre-built patterns for emails, URLs, phone numbers, IP addresses, dates, and more.

Features

  • Real-time match highlighting with color-coded results
  • Support for all JavaScript regex flags: global, case-insensitive, multiline, dotall, and unicode
  • Capture group display for each match
  • Replace mode with support for backreferences ($1, $2, etc.)
  • 12 pre-built common patterns ready to use
  • Comprehensive regex syntax cheat sheet

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