Regex Tester — Live Pattern Matcher
Test regular expressions with live highlighting and match details.
How to Use Regex Tester
Enter a regex pattern with flags
Type or paste a test string
See highlighted matches and capture groups in real time
Your files never leave your browser
No upload wait time. Results in seconds
No daily limits, no file count limits
No account, no subscription, no fees
About Regular Expressions
Regular expressions (regex) are powerful patterns for matching, searching, and manipulating text. They're used in programming, text editors, command-line tools, and databases to find patterns like email addresses, phone numbers, URLs, and more.
Common Regex Patterns
\d+— matches one or more digits[a-zA-Z]+— matches alphabetic words^...$— anchors to start and end of line(group)— captures a group for extraction
Frequently Asked Questions
What regex flavour is used?
This tool uses JavaScript's built-in RegExp engine, which supports Unicode, lookbehind, named groups, and all standard syntax.
What are the flag options?
g (global — all matches), i (case-insensitive), m (multiline — ^ and $ match line boundaries), and s (dotall — . matches newlines).