How to remember regular expressions in python3?

Question

Python

Let's say in php I want to add an @ sign to all words, then I write like this:

echo preg_replace('#(\w+)#si', '\@\\1', 'text text text');

I use ( ) for this - as what I want to remember and \\1 - as a variable, how to do this in python ??

Answer 1

Parentheses will help you, the code example is quick:

>>> import re
>>> re.sub(r"(\w+)", "@\\1", "This is a test")
'@This @is @a @test'

Answer 2

almost the same
https://repl.it/repls/PureVisibleAssembler