Regex Tester
Test and debug regular expressions with real-time matching
Read the full guideMaster your Regular Expressions. Debug patterns in real-time with visual highlighting and group capture details. Perfect for validating emails, parsing logs, or cleaning data strings.
A Regular Expression (Regex) is a sequence of characters that forms a search pattern. It can be used for text search and text replace operations. It is a powerful tool available in almost all programming languages.
Form Validation
Testing patterns for passwords, phone numbers, or usernames before implementing them in code.
Data Extraction
Using capture groups to pull specific information like dates or IDs from large log files.
As you type your pattern, our tool executes the regex against the test string using the JavaScript engine. It visually maps matches and provides the start and end indices for every hit.
| Flag | Name | Effect |
| g | Global | Don't stop at first match |
| i | Ignore Case | Case-insensitive search |
| m | Multiline | ^ and $ work per line |
This tool uses the native JavaScript RegExp engine, ensuring that what you see here is exactly how it will behave in your web apps.