What this tool helps with
Test, debug, and validate your regular expressions online in real-time. Supports JavaScript and PCRE-like syntax with flags, highlighting, and detailed match information.
Recommended workflow
- 1Enter Regex - Input the regular expression pattern in the regex input field
- 2Set Flags - Set regex flags (like g, i, m, etc.) in the flags input box
- 3Select Pattern - Click "Common Patterns" to quickly select preset regex patterns
- 4Input Test Text - Enter the text content to match in the test text area
- 5Execute Test - Click the "Test" button to view matching results
- 6View Results - Check highlighted matches and detailed match information
Capability details
- Real-time Testing - Supports real-time testing and validation of regular expressions
- Syntax Highlighting - Match results are highlighted for easy viewing
- Match Details - Displays match position, capture groups, and other detailed information
- Text Replacement - Supports text replacement based on regular expressions
- Common Patterns - Built-in common regex patterns for email, phone, URL, etc.
- Flag Support - Supports global match (g), ignore case (i), multiline (m) and other flags
Practical use cases
- Data Validation - Validate email, phone number, ID card, and other formats
- Text Extraction - Extract specific format data from text, like URLs or hashtags
- Content Replacement - Batch replace content matching specific patterns in text
- Log Analysis - Extract key information from complex log files
- Code Refactoring - Use regex for batch code modifications and search-and-replace
- Data Cleaning - Clean and format irregular or unstructured data
Privacy, rights, and limits
Most processing is designed to run in the browser whenever possible, which makes the tool useful for quick personal or work files. For sensitive, production, or regulated material, test with a sample first and confirm the target platform's format, size, and quality requirements.
Common questions
What can I use this regex tester for?
Use it for validating emails, phone numbers, URLs, log extraction, replacement rules, and front-end or back-end form validation patterns.
Why does a regex behave differently in another language?
Regex engines differ in syntax, escaping, and flag support. Treat this tool as matching the JavaScript or PCRE-like behavior shown in the UI.
How do I debug a pattern that does not match?
Check flags, escaping, case sensitivity, multiline mode, whitespace, and then simplify the pattern step by step.