python regex 4 digits code example

Example 1: python regex numbers only

import re
re.compile(r'[/d]+') 
# /d refers to any digit
# use other regex patters for ore modifcations
# This can extract the numbers from the regex

Example 2: regex for digits python

[0-9] is not always equivalent to \d. In python3, [0-9] matches only 
0123456789 characters, while \d matches [0-9] and other digit characters, 
for example Eastern Arabic numerals.