Look-behind requires fixed-width pattern issue

I have a regex

(?<=--my-service(\s|\t)*=(\s|\t)*")(.*?)(?=("\s\\\n)|("(\s|\t)*>>(\s|\t)*\/dev\/null(\s|\t)*2>&1))

and this regexp works at least on https://www.freeformatter.com/regex-tester.html

with test data

--my-service="test-service" >> /dev/null 2>&1

it matches

--my-service="test-service" >> /dev/null 2>&1

However, when I try to run this very same regex with python it gives me

look-behind requires fixed-width pattern

Is there any way to translate this regex to python?

Solution 1:

So, what I did was I segregated chunks of regex to groups and then did something like this

\1\2my text\4\5