Regex tester
Validate regular expressions for pattern matching in text.
This tool processes all data locally on your device.
Input
Common patterns
Output
0 characters
No matches found for the current regex pattern.
No explanation available for the current regex pattern.
No valid AST structure available.
Readme
Tool description
A comprehensive online regex evaluator and JavaScript regex validator that allows you to test regular expression patterns against sample text with real-time highlighting and detailed explanations. This regex online editor provides visual feedback, AST (Abstract Syntax Tree) generation, and intelligent pattern explanations to help you understand what your regex does. Perfect for both beginners and experts working with regular expressions.
Features
- Real-time Testing: Test regex patterns against text with instant visual feedback in this online regex evaluator
- Match Highlighting: Visual highlighting of all matched text portions with distinct colors
- Pattern Explanation: Get detailed plain-language explanations answering "what does this regex do?"
- AST Visualization: Generate and view the Abstract Syntax Tree of your regex pattern
- JavaScript Support: Full JavaScript regex validator with ES6+ pattern support
- Common Patterns: Quick access to frequently used regex patterns and examples
- Flag Support: Support for global, case-insensitive, and multiline regex flags
- Match Details: View detailed information about each match including capture groups
- Sample Text Generation: Generate lorem ipsum text for testing patterns
- Copy/Paste Functionality: Easy copying of patterns and results
- Error Handling: Clear error messages for invalid regex patterns
Use cases
- Web Development: Use this regex online editor to test form validation patterns for emails, phone numbers, and URLs
- Data Processing: Validate and extract information from text files and logs with the JavaScript regex validator
- Text Mining: Search for specific patterns in large documents and datasets
- Learning Regex: Understand what regex patterns do with visual feedback and detailed explanations
- Code Review: Verify regex patterns used in applications and scripts
- Data Validation: Test input validation patterns before implementing in production
- Log Analysis: Parse and extract information from application and server logs
- Content Filtering: Create patterns for content moderation and text filtering
- Data Extraction: Extract structured data from unstructured text sources
- Search and Replace: Develop complex search and replace patterns for text editors
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Disclaimer
The tools provided on this website are designed to assist users in solving various problems. While we strive to ensure that the tools are accurate and effective, we do not guarantee or warrant that the output of any tool will be 100% accurate or error-free. The results generated by these tools are provided as-is and should be used with caution. We recommend that users verify any important information or results with additional resources or professional advice, as we cannot be held responsible for any consequences arising from the use of these tools. By using this website, you agree to assume all risks associated with the accuracy and use of the results provided.
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