Capturing groups are one of the most useful feature of regular expressions, and the possibility to name groups make them even more powerful.
Imagine that you have a list of files that are named in a structured way, for example
1_create_users_table.sql, where the number represents some code and the following part a name. So it is
Now instead of parsing those file names, maybe using split or something, you could just write a regex to precisely identify each portion of the string and return them individually? Easy peasy with named capturing groups!
const regex = /(?<code>\d+)_(?<name>\S+)\.sql/; const fileName = '1_create_users_table.sql'; const groups = fileName.match(regex).groups; console.log(groups.code); // 1 console.log(groups.name); // create_users_table
As you can see in the example above, we can specify the name of a capturing group by using the
(?<group-name>...) syntax and the regex engine does the job of returning each group name into the groups property. It is that simple!
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