Why use [\w\W] instead of . in regex-parser?

[mikaello]

When browsing the source code I noticed in the regex used for extracting the front matter that you use [\w\W]:

js-yaml-front-matter/src/index.js

Line 14 in b26f02d

let re = /^(-{3}(?:\n|\r)([\w\W]+?)(?:\n|\r)-{3})?([\w\W]*)*/

Why do you do that, wouldn't . be equal? I.e.:

let re = /^(-{3}(?:\n|\r)(.+?)(?:\n|\r)-{3})?(.*)*/ 

This is a honest question, I just want to understand :-)