Regex Tester & Generator
Regular Expression
Common Patterns
Test String
Results
About Regex Tester
Our Regular Expression (Regex) Tester and Generator is a powerful tool designed to help developers, data analysts, and text processing professionals create, test, and debug regular expressions in real-time. With instant visual feedback and pattern matching, it simplifies the complex task of working with regular expressions.
The tool features live testing capabilities that show matches as you type, making it easier to understand how your regex pattern interacts with the test string. The match highlighting feature visually identifies all pattern matches, helping you quickly verify if your regex is working as intended.
We have also included a collection of commonly used regex patterns for everyday tasks such as email validation, phone number matching, and URL detection. These pre-built patterns serve both as ready-to-use solutions and learning examples for those new to regular expressions.
Frequently Asked Questions
What are Regular Expressions?
Regular Expressions (regex) are powerful text pattern matching and manipulation tools. They allow you to search, match, and replace text using pattern-based rules rather than exact text matches. This makes them invaluable for tasks like form validation, data extraction, and text processing.
What do the different flags mean?
- Global (g): Matches all occurrences of the pattern, not just the first one
- Case Insensitive (i): Makes the pattern match regardless of letter case
- Multiline (m): Makes ^ and $ match the start/end of each line, not just the whole string
How do I use the Common Patterns?
Simply click on any of the common patterns to automatically populate the regex pattern field. You can then modify it as needed or use it as-is. Each pattern comes with an example to help you understand what kind of text it matches.
Why isnt my regex pattern working?
Common issues include:
- Missing or mismatched special characters (like brackets or parentheses)
- Forgetting to escape special characters with a backslash
- Not using the appropriate flags for your use case
- Pattern being too specific or too general for your needs
Is this tool safe to use with sensitive data?
Yes, all pattern matching and testing is performed entirely in your browser. No data is sent to any server or stored anywhere. You can even use the tool offline once the page is loaded.