Regex Tester & Creator
Build, test, and debug regular expressions with our powerful, free online regex tester. Create complex regex patterns effortlessly with our visual builder, explore common patterns, and get real-time feedback on your matches. Perfect for developers, data analysts, and anyone working with text processing.
Pattern Library
Matches email addresses
URL
Matches URLs
Phone Number
Matches international phone numbers
Date (YYYY-MM-DD)
Matches dates in YYYY-MM-DD format
IP Address
Matches IPv4 addresses
Password
Minimum 8 characters, at least one letter and one number
Time (HH:MM)
Matches 24-hour time format (HH:MM)
Hex Color Code
Matches 3 or 6 digit hex color codes
Username
Alphanumeric usernames, 3-16 characters
Slug
Matches slugs used in URLs
HTML Tag
Matches HTML tags
CSS Unit
Matches CSS units like px, em, rem, %
IPv6 Address
Matches IPv6 addresses
MAC Address
Matches MAC addresses
Credit Card Number
Matches Visa and MasterCard numbers
US Zip Code
Matches US ZIP codes with optional 4-digit extension
UUID
Matches UUID version 4
YouTube Video ID
Matches 11-character YouTube video ID
Strong Password
Minimum 8 characters, uppercase, lowercase, number and special character
Floating Point Number
Matches floating point numbers
Binary Number
Matches binary numbers
Hexadecimal Number
Matches hexadecimal numbers
Octal Number
Matches octal numbers
HTML Entity
Matches HTML entities like &
File Path (Unix)
Matches absolute Unix file paths
Windows File Path
Matches Windows file paths
Base64 String
Matches Base64 encoded strings
ISO 8601 DateTime
Matches ISO 8601 datetime strings
Markdown Heading
Matches markdown headings
Image File Extension
Matches common image file extensions
Video File Extension
Matches common video file extensions
HTML Comment
Matches HTML comments
JavaScript Variable
Matches valid JavaScript variable names
Single Line Comment
Matches single-line comments (e.g., in JS/C++)
Multi-line Comment
Matches multi-line comments
Whitespace Only
Matches only whitespace characters
Non-ASCII Characters
Matches any non-ASCII characters
HTML Doctype
Matches HTML5 doctype declaration
Twitter Handle
Matches Twitter usernames
Instagram Handle
Matches Instagram usernames
Alphabet Only
Matches only alphabetic characters
Alphanumeric
Matches alphanumeric characters only
Chinese Characters
Matches Chinese characters
Empty String
Matches an empty string
Pincode (India)
Matches Indian PIN codes (6 digits)
Currency (USD)
Matches USD currency amounts
HTML Attribute
Matches simple HTML attribute declarations
CSV Line
Matches a line of comma-separated values
Repeated Characters
Matches any repeated character sequences
Ends with Period
Matches strings ending with a period
Starts with Capital
Matches strings that start with a capital letter
Not Starting with Digit
Matches strings that do not start with a digit
No Special Characters
Matches strings without special characters
Characters
. - Any character except newline\w - Word character [a-zA-Z0-9_]\d - Digit [0-9]\s - Whitespace[abc] - Any character from set[^abc] - Any character not in setAnchors
^ - Start of string$ - End of stringQuantifiers
* - 0 or more+ - 1 or more? - 0 or 1{n} - Exactly n times{n,} - n or more times{n,m} - Between n and m timesGroups
() - Capture group(?:) - Non-capturing group| - Alternation (OR)Build, test, and debug regular expressions with our powerful, free online regex tester. Create complex regex patterns effortlessly with our visual builder, explore common patterns, and get real-time feedback on your matches. Perfect for developers, data analysts, and anyone working with text processing.
Why Use Our Regex Tester?
- Interactive Regex Builder: Construct patterns with a click using our visual interface, no regex expertise required.
- Real-Time Testing: Instantly see matches, capture groups, and errors as you type.
- Replace Functionality: Test string replacements with live previews, ideal for text manipulation tasks.
- Comprehensive Cheat Sheet: Access an interactive regex reference to learn and apply patterns quickly.
- Pattern Library: Browse and apply common regex patterns like email, URL, and phone number validation.
- Dark Mode Support: Work comfortably in any lighting with our sleek, responsive design.
How to Use the Regex Tester
- Enter your regex pattern in the expression field or use the builder to construct it.
- Type or paste your test string in the text area to see matches highlighted instantly.
- Toggle flags (e.g., global, case-insensitive) to customize your regex behavior.
- Use the replace tool to test string substitutions with real-time results.
- Explore the explanation panel to understand your pattern's components.
- Refer to the cheat sheet or pattern library for quick access to common regexes.
What is a Regular Expression (Regex)?
A regular expression (regex) is a sequence of characters that defines a search pattern. Regexes are used for tasks like validating input (e.g., emails, phone numbers), searching text, and replacing strings. Our regex tester simplifies these tasks by providing a user-friendly interface to create and test patterns, complete with explanations and examples.
Common Regex Patterns
Our pattern library includes ready-to-use regexes for common use cases. Here are a few examples:
- Email Validation: Ensure email addresses follow the correct format.
- URL Matching: Extract or validate URLs from text.
- Phone Number Validation: Match international phone numbers.
- Date Format (YYYY-MM-DD): Validate dates in standard format.
Browse the sidebar to apply these patterns instantly or customize them to suit your needs.
Learn Regex with Our Interactive Tools
Whether you're a beginner or an experienced developer, our regex tester helps you learn and master regular expressions. The interactive cheat sheet and detailed explanations break down complex patterns into understandable components, making regex accessible to everyone.
Start Testing Your Regex Now
Ready to create and test your regular expressions? Use our free regex tester to build patterns, validate text, and streamline your workflow. No signup required—just start exploring!