RegEx Cheat Sheet
Anchors
^Start of string$End of string\bWord boundaryQuantifiers
*0 or more times+1 or more times?0 or 1 time{n,m}Range (min, max)Character Classes
\dDigit (0-9)\wWord (a-z, 0-9, _)\sWhitespace.Any characterGroups & Logic
(...)Capture group[...]Character set(?:...)Non-capturing|Alternation (OR)RegEx Tester & Master — Professional RegEx Workstation
RegEx Cheat Sheet
Instant access to a professional reference guide covering anchors, quantifiers, classes, and groups directly in your workstation.
Live Highlighting
Instantly see matches in your test string as you type your regex or modify the text.
Technical Precision
Detailed pattern testing with support for advanced JavaScript RegExp features and real-time validation.
Secure & Local
Your patterns and test data never leave your browser. Perfect for debugging sensitive strings locally.
How to Use RegEx Tester?
1. Enter Pattern
Type your regular expression in the top input field. Do not include the starting and ending slashes.
2. Set Flags
Select the desired flags like 'Global' or 'Case Insensitive' to refine your search behavior.
3. Input Test Text
Paste or type the text you want to test against. Matches will be highlighted automatically.
4. Reference Cheat Sheet
Refer to the permanent cheat sheet below to quickly find the right syntax for your regular expression.
Why Use DevUsta RegEx Tester?
Regular expressions can be cryptic. Our tool not only tests your patterns in real-time but also provides a comprehensive cheat sheet to help you master every syntax rule instantly. 100% private and client-side.
About & FAQ
Everything you need to know about the DevUsta Tools platform.
Explore Other Tools
JSON Prettier
Format, validate, and beautify your JSON data with a sleek, user-friendly interface.
Diff Checker
Secure Diff Checker
SQL Formatter
Format and minify complex SQL queries instantly in your browser.
Video Editor
Professional video editing and conversion directly in your browser with FFmpeg.wasm.
Secure PDF
Professional browser-based Secure PDF tool. Sign documents, merge files, sanitize metadata, and compress PDF with 100% client-side security. No uploads, total privacy.
JWT Debugger
Secure and Local JWT Analysis
SVG Optimizer
Secure and Local SVG Optimization
Image Editor
Compress, resize, and remove metadata from images 100% locally in your browser.
Base64 Converter
100% Private Base64 converter. Encode and decode strings locally in your browser using WebAssembly. Convert Base64 to image or PDF safely.
Secure QR
Create custom QR codes with logos, colors, and unique shapes. Scan QR codes securely from your camera or images. Everything runs locally in your browser for maximum privacy.
Local Clipboard / Scratchpad
Secure and local scratchpad.
DNS Analyzer
Analyze your domain's DNS records (A, MX, TXT, CNAME) in real-time across Google & Cloudflare. Perform free security health checks for SPF, DMARC, and DNSSEC.