Regex Tester
Test JavaScript regular expressions in real time. See matches highlighted as you type.
Online Regex Tester with Real-Time Match Highlighting
Regular expressions are powerful but notoriously hard to debug. This regex tester gives you instant visual feedback — type your pattern and see exactly what matches, with capture groups highlighted. Supports all JavaScript regex flags (g, i, m, s, u, y).
When to use: Writing email/phone/URL validation patterns, extracting data from logs or HTML, testing regex for production code, learning regular expressions with live feedback.
📚 Regex Pattern Library — click to expand
Online Regex Tester with Real-Time Match Highlighting
Regular expressions are powerful but notoriously hard to debug. This regex tester gives you instant visual feedback — type your pattern and see exactly what matches, with capture groups highlighted. Supports all JavaScript regex flags (g, i, m, s, u, y).
When to use: Writing email/phone/URL validation patterns, extracting data from logs or HTML, testing regex for production code, learning regular expressions with live feedback.