Regex Tester
Test your regular expressions in real time with match highlighting and group extraction.
Common use cases
Practical ways developers use the regex tester in real workflows.
Validate input patterns
Test email, phone number, or date patterns before embedding them in form validation logic.
Extract structured data
Write a regex to pull IDs, URLs, or tokens out of log lines or API responses.
Search and replace
Prototype find-and-replace patterns before applying them in your editor or build scripts.
Frequently asked questions
Short answers to the questions people usually have before using the tool.
Which regex flavor does this tester use?+
It uses JavaScript's built-in RegExp engine, so the behavior matches what you get in Node.js and modern browsers.
What do the flags g, i, m mean?+
g (global) finds all matches instead of stopping at the first. i (case-insensitive) ignores letter case. m (multiline) makes ^ and $ match line starts and ends.
Can I test named capture groups?+
Yes. Use the (?
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