Best Features of ES2018 — Regex

Best Features of ES2018 — Regex

Since 2015, JavaScript has improved immensely. It’s much more pleasant to use it now than ever. In this article, we’ll look at the best features of ES2018.

Since 2015, JavaScript has improved immensely.

It’s much more pleasant to use it now than ever.

In this article, we’ll look at the best features of ES2018.

Numbered Capture Groups

Numbered capture groups lets us take apart a string with a regex.

This is the old way to get group matches.

A regex that matches a string returns a matched object.

Then we can get each part by its index.,

For instance, we can write:

const PHONE_REGEX = /([0-9]{3})-([0-9]{3})-([0-9]{4})/;

const matchObj = PHONE_REGEX.exec('123-456-7890');

We have 3 capture groups. 2 with 3 digits and one with 4 digits.

Then we can get each group by its index.

The problem with named capture groups is that we’ve to count parentheses.

We’ve to know what the groups are about from the regex pattern.

And we’ve to change the code if we change the regex.

javascript technology software-development programming web-development

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