Golang Regular Expression Online Tester
Test Go regex patterns with match, replace, and split operations
Go Regex Configuration
Operation Type
Go Regex Options
Test Results
No Golang regex tests performed yet
Enter a regex pattern and test text, then click "Test Golang Regex"
Quick Golang Regex Examples
Email Validation
^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$
Validates email addresses with proper format
Phone Number
\d{3}-\d{3}-\d{4}
Matches phone numbers in XXX-XXX-XXXX format
URL Pattern
https?://[^\s]+
Matches HTTP and HTTPS URLs
Hashtag
#\w+
Matches hashtags starting with #
Date Format
\d{4}-\d{2}-\d{2}
Matches YYYY-MM-DD date format
Strong Password
^[A-Za-z\d@$!%*?&]{8,}$
Validates strong password requirements
When to Use Golang Regex Tester
Go Development
Test regex patterns before implementing in Go applications, validate input processing, and debug pattern matching
Input Validation
Validate user inputs, sanitize data, and ensure proper format compliance in Go web applications and APIs
Text Processing
Extract data from text, parse log files, process documents, and perform complex text transformations in Go
Learning & Education
Learn Go regex syntax, practice pattern matching, understand Go regex features, and debug complex expressions
Debugging
Debug existing regex patterns, identify matching issues, optimize performance, and fix pattern errors in Go code
Data Extraction
Extract specific data from text, parse structured formats, and process large datasets with Go regex patterns
Frequently Asked Questions
What is a Golang regex tester?
A Golang regex tester is a tool that allows developers to test and validate regular expressions using Go's native regex engine. It provides real-time pattern matching, replacement operations, string splitting, and debugging capabilities. This tool helps developers write, test, and debug regular expressions before implementing them in Go applications, ensuring patterns work correctly with Go's specific regex behavior and syntax.
How do I use this Golang regex tester?
Using our Golang regex tester is simple: 1) Enter your regular expression pattern in the regex input field, 2) Add test text in the text input area, 3) Choose operation type (Match, Replace, or Split), 4) Configure Go regex options like case-insensitive matching, 5) For replace operations, enter replacement text, 6) Click 'Test Go Regex' to see results with match highlighting and detailed analysis.
Is this Golang regex tester free to use?
Yes, our Golang regex tester is completely free to use with no registration required. You can test unlimited regular expressions, use all features including match/replace/split operations, and access all functionality without any cost. There are no hidden fees, premium features, or usage limits.
What Golang regex operations are supported?
Our Golang regex tester supports three main operations: Match (find all matches with highlighting), Replace (replace matched text with new content), and Split (split text using regex as delimiter). All operations are compatible with Go's regexp package and support Go-specific regex features including named groups, case-insensitive matching, and proper Unicode handling.
What are the differences between Go regex and other languages?
Go's regex engine has some unique characteristics: it uses RE2 syntax (not PCRE), doesn't support lookahead/lookbehind assertions, has different group handling, and uses different flag syntax. Our tool accurately simulates Go's regex behavior, including proper handling of Go's regexp.Compile() and regexp.MustCompile() functions, making it perfect for Go development.
Can I test replace operations with capture groups?
Yes, our Golang regex tester fully supports replace operations with capture groups. You can use $1, $2, $3, etc. in your replacement text to reference captured groups, or use ${name} for named groups. The tool shows detailed group information and replacement results, exactly as they would appear in Go code using regexp.ReplaceAllString() or similar functions.
How accurate is the Golang regex testing?
Our Golang regex tester uses JavaScript's regex engine which closely follows Go's RE2-based regex implementation. While there may be minor differences in some edge cases, the core functionality, syntax, and behavior are consistent with Go's regexp package. The tool provides accurate testing for most common Go regex patterns and use cases.
Can I debug complex Golang regex patterns?
Yes, our Golang regex tester is excellent for debugging complex patterns. It provides detailed match information, group extraction, position tracking, and real-time highlighting. You can test your pattern against various inputs, see exactly what matches and what doesn't, identify performance issues, and refine your regex until it works perfectly. The tool is particularly useful for debugging Go-specific regex features and ensuring compatibility with the regexp package.
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