REGEX
Test and validate regular expressions with instant feedback. Watch your patterns come to life with real-time match highlighting, capture group extraction, and detailed position tracking. Whether you're debugging a complex pattern or learning regex fundamentals, get immediate visual results with full support for JavaScript regex flags.
. Any character (except newline)\d Digit (0-9)\w Word character (a-z, A-Z, 0-9, _)\s Whitespace[abc] Any of a, b, or c[^abc] Not a, b, or c* 0 or more+ 1 or more? 0 or 1{n} Exactly n{n,} n or more{n,m} Between n and m^ Start of string/line$ End of string/line\b Word boundary(abc) Capture group(?:abc) Non-capturing groupa|b a or bRegular expressions (regex) are powerful patterns for matching and manipulating text. Test your regex patterns with live highlighting and detailed match information.
Why Use This Regex Tester? Unlike simple validators, our tool shows you exactly how your pattern behaves. Watch matches highlight in real-time, inspect capture groups to understand what your pattern extracts, and test replacements before applying them to production code. The visual feedback helps you learn regex syntax faster and debug complex patterns with confidence.
Features: Live match highlighting, capture groups extraction, flags (g, i, m, s, u), replace mode with preview, URL sharing, JavaScript regex engine.
Common Use Cases: Validate email addresses and phone numbers, extract data from log files and API responses, clean and format user input, find and replace text patterns in code, parse structured text like CSV or JSON, and test patterns before implementing them in JavaScript, Python, or other languages. The JavaScript regex engine provides broad compatibility, making patterns you develop here transferable to most modern programming environments.