How to use regex with optional characters in python?

Question

Say I have a string

\"3434.35353\"

and another string

\"3593\"

How do I make a single regular expression

Answer 1

use (?:|). replace with the string to make optional. I tested in python shell and got the following result:

>>> s = re.compile('python(?:3|)')
>>> s
re.compile('python(?:3|)')
>>> re.match(s, 'python')

>>> re.match(s, 'python3')
```