Regex Tester
Test and debug regular expressions with real-time pattern matching
Regular Expression Pattern
Test Text
Match Results
When to Use Regex Tester
Data Validation
Test regex patterns for validating email addresses, phone numbers, passwords, and other user input before implementing in your applications.
Text Parsing
Extract specific information from logs, documents, or data files by testing patterns that match URLs, dates, numbers, or custom formats.
Pattern Debugging
Debug complex regex patterns by seeing real-time matches and understanding why certain patterns work or fail with your test data.
Learning Regex
Learn regular expressions by experimenting with different patterns and seeing immediate visual feedback on how they match text.
Data Cleaning
Test patterns for cleaning and formatting data by matching unwanted characters, whitespace, or inconsistent formatting in text files.
Code Development
Prototype and test regex patterns before integrating them into your code, ensuring they work correctly with edge cases and various input formats.
Frequently Asked Questions
What is a regex tester?
A regex tester is an online tool that allows you to test and validate regular expressions against sample text in real-time. It shows matches, groups, and pattern explanations to help you understand how your regex pattern works.
How do I use this regex tester?
Enter your regular expression pattern in the regex input field, add your test text in the text area, and see real-time matches with highlighting. You can toggle flags (global, case-insensitive, multiline) and view results in highlight, list, or groups format.
Is this regex tester free to use?
Yes, our regex tester is completely free to use with no registration required. You can test unlimited patterns and text without any restrictions or hidden fees.
What regex flavors are supported?
Our tool supports JavaScript regex flavor, which is compatible with most common regex patterns used in web development and general text processing. This covers the majority of regex use cases.
Are my regex patterns and test data saved?
No, all data remains in your browser only. We don't store or transmit your regex patterns or test text to our servers, ensuring complete privacy and security of your data.
Can I copy the regex pattern or matches?
Yes, you can easily copy your regex pattern, test text, or match results using the copy buttons provided throughout the interface. All results can also be downloaded as text files.
What are regex flags and how do I use them?
Regex flags modify how patterns are matched. The 'g' flag finds all matches (global), 'i' ignores case sensitivity, and 'm' enables multiline matching where ^ and $ match line boundaries instead of string boundaries.
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