BEHIND THE TOOL
Test a JavaScript regular expression against text
Enter a pattern, flags and test text to see the matches found by JavaScript regular expressions.
Pattern + textMatchesRuns locally
01Pattern + text
02Run RegExp
03Matches
Pattern + text → Run RegExp → Matches
Flags can completely change regex behavior
For example, the global flag searches for every match instead of stopping after the first one.
Your input stays in the browser
Processing runs directly in the page without requiring the content to be sent to UtilityLake.
02
Useful details
Is the original input modified?
No. The tool produces a new result while leaving the entered source unchanged.
Does processing happen locally?
Yes. The content is processed in your browser.