regex replace all non alphanumeric characters code example

Example 1: python regex replace all non alphanumeric characters

import re

s = re.sub('[^0-9a-zA-Z]+', '*', s)

Example 2: c# filter non alphanumeric characters

Regex rgx = new Regex("[^a-zA-Z0-9 -]");
str = rgx.Replace(str, "");