Regex Tester & Debugger – Instantly Test Your Regular Expressions
✅ What is a Regex Tester?
A Regex Tester is an online tool that helps you test and debug regular expressions (regex) in real-time. Whether you’re a developer, data analyst, or student, this tool lets you check your pattern against input strings, highlight matches, and refine your regex for accuracy.
🛠️ Features: Real-time Matching – See results as you type. Syntax Highlighting – Easily identify matched groups and patterns. Group Breakdown – View captured groups in a clear structure. Multi-line Support – Test across multiple lines of text. Export Results – Copy matches or export them as needed. 🚀 Why Use Our Regex Tester? Fast and lightweight — No unnecessary clutter. Beginner-friendly — Easy to start for regex learners. Powerful debugging — Spot errors and optimize expressions quickly. Mobile responsive — Test regex on any device. 🧠 Common Use Cases: Validating email, phone numbers, or URLs Extracting specific data from text Search and replace in code or documents Filtering logs and JSON content Form input validation 📚 Helpful Examples: Try these patterns to get started: Match an email: ^[\w.-]+@[\w.-]+\.\w{2,}$ Validate a phone number: ^\+?\d{10,15}$ Extract domain from URL: https?:\/\/(www\.)?([\w\-\.]+) 🔒 Your Data is Safe We respect your privacy. No input or pattern is stored or logged — all regex tests run in your browser locally. ✅ Start using the Regex Tester now and make regular expressions easy to manage!
Regex Tester & Debugger
Regular Expression
Test String
Match Results
Regex Cheatsheet
Character Classes
.
Any character except newline\w
Word character:[A-Za-z0-9_]
\W
Not word character\d
Digit:[0-9]
\D
Not digit\s
Whitespace\S
Not whitespace
Anchors
^
Start of string$
End of string\b
Word boundary\B
Not word boundary
Quantifiers
*
0 or more+
1 or more?
0 or 1{n}
Exactly n{n,}
n or more{n,m}
Between n and m
Groups & Lookaround
(...)
Capturing group(?:...)
Non-capturing group(?=...)
Positive lookahead(?!...)
Negative lookahead(?<=...)
Positive lookbehind(? Negative lookbehind