What does \ d in javascript regex do?

Question

What does \dthis example do?

/Chapter (\d+)\.\d*/

Answer 1

In what context?

In regular expression, it corresponds to the number (0-9).

Edit according to your comment:

It matches any line starting with a chapter, then digits, then a period, then a number of digits. As Chapter 1.0well as Chapter 12.01.

Answer 2

In regular expression, this means the numbers 0-9

\dNumbers 0 through 9 /H\d/correspond to "H3"

Answer 3

(match replace split)) /... /, , , 0-9. , , , .