RegEx Tester
Test your regular expressions against text strings. Real-time matching and highlighting.
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About RegEx Tester
The RegEx Tester is an interactive tool designed to help developers write, test, and debug Regular Expressions (RegEx). It provides real-time matching, highlighting, and explanation of your patterns against test strings.
How to Use?
- Enter your Regular Expression pattern in the top input field.
- Add flags (like global, case-insensitive) if needed.
- Type or paste your test string in the text area below.
- Observe the real-time matches highlighted in the text.
- Check the "Match Information" section for details on captured groups.
Features
- Real-time RegEx evaluation.
- Support for JavaScript RegEx syntax.
- Highlighting of matched strings.
- Detailed breakdown of match groups and indices.
- Helpful quick reference for common RegEx tokens.
FAQ
What is a Regular Expression?
A Regular Expression (RegEx) is a sequence of characters that specifies a search pattern. It is widely used for string searching, validation (e.g., email format), and replacement operations.
How does RegEx Tester work?
This tool uses the browser's built-in JavaScript RegExp engine to execute your pattern against the provided text and visualize the results instantly.
What are RegEx flags?
Flags are optional parameters that modify the search behavior. Common flags include `g` (global search), `i` (case-insensitive), and `m` (multiline).
Why is my RegEx not matching?
Check if you have selected the correct flags or if there are special characters that need escaping (e.g., `.` or `?`).