Regex Visualizer
Visualize JavaScript regular expressions online with live match highlighting, capture groups, and flag toggles.
Regex Visualizer
Visualize JavaScript regular expressions online with live match highlighting, capture groups, and flag toggles.
About this regex visualizer
Uses the browser JavaScript RegExp engine
This regular expression visualizer compiles your pattern with the browser JavaScript RegExp engine and supports g, m, i, s, u, and y flags. It is best for JavaScript validation, frontend parsing, and web-form patterns, rather than PCRE, .NET, Python, or server-side regex dialects.
Inspect matches and capture groups
Matched ranges are highlighted in the test string, then listed with indexes and captured groups. Turn on global search to inspect every match returned by matchAll, or disable it to focus on the first browser match while debugging a pattern.
FAQ
Common questions and answers about this topic.
What does this tool do?
It is an online regex visualizer for JavaScript RegExp patterns. Enter a pattern and sample text to highlight matches, inspect match indexes, and review captured groups in the browser.
Which regex flavor is supported?
JavaScript regular expression syntax is supported, including global, case-insensitive, multiline, dotAll, Unicode, and sticky flags. PCRE, .NET, Python, and other server-side regex flavors may behave differently.
Can I test my regex against sample text?
Yes, paste sample text to see matches highlighted in real time, with match indexes and captured groups listed beside the visualization.
Is my data sent to any server?
No, regex visualization and testing run entirely in your browser. Your patterns and test strings are processed locally with JavaScript and never leave your device.