Named capturing groups in JavaScript regexes

In regular expressions, you can give names to capturing groups. There is a special syntax for this. Here it is: (?<name>pattern), where a pattern is the regex and a name is the name of the capturing group.

Let's look at an example. Let's say we have the following string:

javascriptlet str = '2025-10-29';

Let's make a regex in which the capturing groups are named:

javascriptlet reg = /(?<year>\d{4})-(?<month>\d{2})-(?<day>\d{2})/;

Let's apply a regex to our string:

javascriptlet res = str.match(reg);

The capturing groups data will go into the groups property of the result as an object:

javascriptconsole.log(res.groups);

We can access each object element separately:

javascriptconsole.log(res.groups.year);  // 2025
console.log(res.groups.month); // 10
console.log(res.groups.day);   // 29

javascriptlet str = '12:59:59';