What are some common regex patterns and their uses?

What are some common regex patterns and their uses?

Common regex patterns include:

1. \d - Matches any digit.
2. \w - Matches any word character (alphanumeric + underscore).
3. ^ - Asserts position at the start of a line.
4. $ - Asserts position at the end of a line.
5. .* - Matches any character (except for line terminators) zero or more times.

Can you give me an example of how to use \d in a regex?

Sure! If you want to find all the numbers in a string, you can use the regex \d+. This will match one or more digits in a row.

What about matching email addresses?

To match email addresses, you can use a regex like ^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$. This pattern checks for a valid email format.

Are there any tools to test regex patterns?

Yes, there are several online tools like Regex101 and RegExr that allow you to test and debug your regex patterns interactively.