How regular expressions that contain newline characters match

How the regular expression containing the newline character matches:

\s\s

\s is a variety of whitespace characters, such as \n\t, and \s is ^\s

Point number (.) Any single character other than the line break can be matched, which is called a wildcard.

Match any word that contains \ n inside the trailing characters (. | \ n).

import re strvar  = """hello world!""" patt  = r ‘(.|\n)*‘ rs  = re.match(patt, strvar) print rs.group()

Use regular expressions to get any of the characters in a piece of text and write the following matching rules:
(.*)
The result is run and the text after the line break is not found. So I checked the manual and found the regular expression, "." (dot symbol) matches all characters except the newline character "\ n".
The following is the correct regular expression matching rule:
([\s\s]*)
It can also be expressed as "([\d\d]*)", "([\w\w]*)").

How regular expressions that contain newline characters match