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Regex Tester

Test and debug regular expressions with global match and case-insensitive options, real-time match results

Regex Tester

Tip: Enter only the regex pattern, no need to include slashes /

Match results will appear here...

Common Syntax Reference

Common Metacharacters
.Match any character except newline
\wMatch letter, digit or underscore
\sMatch any whitespace character
\dMatch digit
\bMatch word boundary (start or end)
^Match start of string
$Match end of string
Common Quantifiers
*Repeat zero or more times
+Repeat one or more times
?Repeat zero or one time
{n}Repeat n times
{n,}Repeat n or more times
{n,m}Repeat n to m times
Common Negation
\WMatch any character that is not letter, digit, underscore, or Chinese
\SMatch any character that is not whitespace
\DMatch any non-digit character
\BMatch position that is not word boundary
[^x]Match any character except x
[^aeiou]Match any character except aeiou
Regex Modifiers
iignore - Case insensitive
gglobal - Find all matches
mmulti line - ^ and $ match line breaks
sdotAll - . matches newline \n

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Tool Content
What does this tool do?

Real scenario + problem description:

When working with text processing, data validation, or search functionality, you need to ensure your regex patterns work correctly before implementing them in code.

Why do you need this tool?

Compare to manual/other solutions:

Writing and testing regex patterns manually is error-prone and time-consuming. This tool provides instant visual feedback with highlighted matches and detailed capture groups.

Usage Steps
  1. Enter your regular expression pattern
  2. Input the test text you want to match against
  3. Select options like global search and case sensitivity
Frequently Asked Questions (FAQ)
Q1: What regex flags are supported?
A1: We support global search (g) and case insensitive (i) flags. These are the most commonly used flags for testing patterns.
Q2: How do I test for multiple matches?
A2: Enable the 'Global Search' option to find all matches in your text, not just the first one.
Q3: What if my regex syntax is invalid?
A3: The tool will display an error message and highlight the syntax issue. Check your pattern for missing brackets, quantifiers, or escape characters.
Regex Tester Tool Guide
Tool Introduction

This is a free online regular expression testing tool that supports testing and debugging regular expressions, provides global match and case-insensitive options, displays match results in real-time, helping you quickly verify the correctness of regular expressions.

Usage Steps
  1. Enter the regular expression to test in the pattern input box
  2. Enter the text to match in the test text input box
  3. Select match options: Global Search (-g) and Ignore Case (-i)
  4. Click the "Test" button or wait for automatic testing
  5. View match results, including match content, position, and capture groups
Frequently Asked Questions
👥Who is this tool suitable for?

This tool is suitable for developers, designers, content creators, and individuals or businesses who need to handle related tasks.

🎯What results can you get using this tool?

Using this tool, you can quickly obtain high-quality processing results, improve work efficiency, and ensure the professionalism and accuracy of output content.

📋Use Cases
Web Development

Integrate tool functionality in web development to enhance user experience and page performance

Mobile Apps

Provide core functionality support for mobile applications and optimize user interaction experience

Social Media

Used for social media content creation to improve content quality and user engagement

Email Marketing

Enhance email marketing effectiveness and improve open rates and conversion rates

Personal Storage

Personal file management and storage optimization to ensure data security and easy access

💡Best Practices
Quality Settings

Configure appropriate quality settings based on usage scenarios to ensure optimal results

Format Selection

Choose the most suitable format according to your needs and compatibility requirements

Size Optimization

Adjust parameters to achieve the best balance between quality and efficiency

🔧Technical Details
Processing Algorithm

Uses advanced algorithms to ensure efficient and accurate processing results

Quality Metrics

Provides comprehensive quality assessment and optimization suggestions

⚠️Usage Notes
  • All data processing is completed locally in the browser and will not be uploaded to the server
  • Please select appropriate parameters according to your actual needs
  • It is recommended to backup the original file before processing important data
  • If you encounter problems, please refresh the page and try again or contact technical support
🤔Common Questions
Q: Is this tool safe?
A: Completely safe! All processing is done locally in the browser without uploading any data to the server.
Q: What file formats are supported?
A: The tool supports common file formats. Please refer to the tool introduction for specific supported formats.
Q: Are there usage restrictions?
A: The tool is completely free with no usage limit. However, please use it reasonably and avoid abuse.
Regex Tester - Online Regular Expression Testing Tool