Regular expressions are incredibly powerful but notoriously difficult to get right. The Regex Tester gives you a live testing environment where you can write, test, and debug regex patterns with instant visual feedback on matches.
Type your regex pattern in the top field and your test string below. Matches are highlighted in real time as you type, with different colors for capture groups so you can see exactly what each part of your pattern is matching. No more running your code, checking output, tweaking, and running again.
The built-in regex explainer breaks down your pattern into plain English. Hover over any part of the expression to see what it does. This is invaluable for learning regex or understanding patterns written by others. The tool also includes a library of common patterns for emails, URLs, phone numbers, dates, and more.