What is Regex?
Regular expressions (regex) are patterns used to match character combinations in strings. They’re supported by virtually every programming language and used heavily in text processing, validation, and search operations.
How to Use
- Enter your regex pattern in the pattern field
- Set flags (g, i, m, etc.)
- Type or paste your test string
- View matches highlighted in real-time
Common Regex Patterns
| Pattern | Description |
|---|---|
\d+ | One or more digits |
[a-zA-Z]+ | One or more letters |
\b\w+@\w+\.\w+\b | Simple email |
https?://\S+ | URL |
\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b | IPv4 address |
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