Replace non alphanumeric characters except some exceptions python

Question

In perl s/[^\\w:]//g would replace all non alphanumeric characters EXCEPT :

In python I\'m using re.sub(r\'\\W+\', \'\',mystring)

Answer 1

re.sub(r'[^a-zA-Z0-9=]', '',mystring)

You can add whatever you want like _ whichever you want to save.