python how to extract operators from string

Question

I want to extract operators like: +,-,/,* and also (,),_ from the string

Eg.

a-2=b
(c-d)=3

output:

- ,=, (, -, ), = 

This does not work:

re.finditer(r'[=+/-()]*', text)

Answer 1

Your re needs to escape some of the characters with a backslash. (+, -, (, ) have their special meanings in re).

Anyway, for this you don't need re:

(c for c in s if c in '+-/*()_')