§ Capture groups in regular expressions

Capture groups in JavaScript allow you to match and extract specific pieces of information from strings or arrays. They are a powerful tool for working with data and can be used to simplify and streamline your code.

To use capture groups, you can use parentheses in your regular expression to enclose the pattern that you want to match. For example, the following regular expression uses capture group to match the second part of an email:

/\S+@(\S+\.\S+)/g
email.replace(/\S+@(\S+\.\S+)/g, '...@$1')

If we have bob@example.com and use this regular expression, the group (\S+\.\S+) will match example.com.

Capture groups are a useful feature of regular expressions and can be used to extract specific pieces of information from text in a concise and efficient way.