Live Regex Testing
Test regular expressions against sample text and quickly review matching results.
Regex Tester
Test and debug regular expressions instantly with real-time matching, capture groups, and match details.
Ready
/
/
0 characters
Match Results
Enter a regex and test string.
Matches will appear here.
Matches
0
Capture Groups
0
Processing
Browser Only
FREE ONLINE REGEX TESTER — NO SIGN UP REQUIRED
Regex Tester
Test Regular Expressions Quickly and Easily
Test regular expressions against sample text, check matches, identify patterns, and debug regex expressions quickly without writing a separate testing program.
Useful for developers, programmers, web designers, testers, students, and anyone working with text patterns or data validation.
Free to Use
Live Regex Testing
Match Detection
Browser Based
Quick Tool Overview
The All Free Tool's Regex Tester helps you test regular expressions against sample text and quickly see whether your pattern matches the content.
Enter your regular expression, provide the text you want to test, and review the matches and results generated by the tool.
Regex testing is useful for validating patterns, debugging expressions, extracting text, searching content, and building applications that work with structured or unstructured text.
About the Regex Tester
What Is a Regular Expression?
A regular expression, commonly called regex or regexp, is a pattern used to search, match, validate, or manipulate text according to specific rules.
Why Test Regex?
Regex expressions can become difficult to understand as they become more complex. Testing a pattern against sample text makes it easier to identify incorrect matches, missing matches, and unexpected behavior.
Common Regex Uses
Regular expressions can be used for email-like pattern validation, extracting numbers, finding words, checking formatting, replacing text, parsing data, and searching through large amounts of content.
How the Regex Tester Works
Enter a regular expression and sample text into the appropriate fields. The tester evaluates the pattern against the text and displays the available matches and results.
Regex Flags and Options
Depending on the supported regex engine, options such as case-insensitive matching, global matching, multiline matching, or other flags can change how a pattern behaves. Always check which features the selected engine supports.
Key Features
Match Detection
Identify portions of your test text that match the supplied regular expression.
Regex Debugging
Experiment with patterns and make adjustments when an expression does not behave as expected.
Pattern Validation
Check whether a regex pattern behaves correctly against the examples you provide.
Capture Groups
Review captured portions of matching text when supported by the selected regex engine.
Regex Flags
Use supported regex flags to change matching behavior and test different scenarios.
Developer Friendly
Useful for programmers working with validation, parsing, searching, and text-processing logic.
Simple Interface
Enter your pattern and sample text through a straightforward testing interface.
Fast Results
Quickly test patterns without creating a separate script or application.
Browser Based
Use the regex tester directly from your browser without installing additional software.
How to Use the Regex Tester
Follow these simple steps to test and debug your regular expression.
Enter Your Regex Pattern
Enter the regular expression you want to test into the regex pattern field.
Pro Tip: Start with a simple pattern before building a more complex expression.
Enter Test Text
Enter or paste the text you want your regex pattern to search or match.
Pro Tip: Include both matching and non-matching examples to properly test your pattern.
Select Regex Options
Enable supported flags or options when you need to change how the expression matches text.
Pro Tip: Test one flag at a time when debugging unexpected matching behavior.
Run the Test
Start the test to evaluate your regex against the supplied sample text.
Pro Tip: Use realistic sample data that closely resembles the text your application will process.
Review Matches
Review which parts of the sample text matched your regular expression.
Pro Tip: Check whether the expression is matching exactly what you intended.
Check Capture Groups
Review captured values when your expression uses groups and the tester supports them.
Pro Tip: Use capture groups when you need to extract specific portions of matched text.
Refine the Pattern
Modify your regex when the result contains unwanted matches or misses expected text.
Pro Tip: Make small changes and test again instead of rewriting the entire pattern.
Verify the Final Pattern
Test your completed expression against several different examples before using it in production.
Pro Tip: Include edge cases and unexpected input when validating important regex patterns.