python - I need to filter contents of my text file

Question

I have a text file that I want to loop through, slice some contents, and store in a separate list. The text file contains:

blu sre
before we start
start the process
blah blah
blah blha
end the process
blah b?ah
start the process
blah blah
blah blha
end the process
start the process
blah blah
end the process
blah

I want to catch all text between 'start the process' and 'end the process' and store in a new list so that each line of the list will contain every text between start the process and end the process. The desired new list should be like this

list[0] start the process  
blah blah  
blah blha  
end the process   
list[1] start the process  
blah blah  
blah blha  
end the process   
list[2] start the process  
blah blah  
end the process  

Here is the code I prepared. I don't why its not giving me the required result.

list = []
text = 'start the process'
text2 = 'end the process'
for pattern in range (len(file)):
    if text in file[pattern]:
        x = pattern
    if text2 in file[pattern]:
        y = pattern
    list[i]= file[x:y]
 i = i+1

Answer 1

Regex is built for that.

import re

part = re.compile(r"start the process(.*?)end the process", flags=re.DOTALL)
wirh open("my_file.text", "r") as file:
    data = file.read()

results = list(part.findall(data))

EDIT update code based on @Xosrov comment