Regex Tester Tool

Test regular expressions with real-time highlighting, match information, and string replacement.

Regular Expression Pattern

Test String

Replacement String

Results

No matches found

About Regex Tester

Regular expressions (regex) are powerful patterns used to match character combinations in strings. This tool helps you test, debug, and visualize your regular expressions before using them in your code.

Key features:

Real-time testing: See matches as you type
Match highlighting: Visually identify where matches occur in your text
Capture groups: View named and numbered capture groups
Replacement: Test string replacement operations
Regex flags: Toggle global, case-insensitive, multiline, and other modes
Batch mode: Apply multiple replacements at once
Reference: Built-in regex cheat sheet for quick syntax lookup

Regular expressions are supported in most programming languages including JavaScript, Python, Java, PHP, and many text editors. Test your patterns here before implementing them in your code.