Regex: positive lookbehind

[Secret]

Hi

I am new to Python. I have used regex in Uipath but when I transferred my regex expression to Python it doesn't seem to work. I get error "NoneType object has no attribute 'group'", which mean a match is not found.

But my regex expression works fine in Uipath.

 text_lines=f.readlines()
       model_regex=re.compile(r'(?<=model choice :).*')
       model=model_regex.search('text_lines')
       #print(text_lines)
       print(model.group()) 

1) do I have to place my variable (text_line) in quotation marks here?

model=model_regex.search('text_lines')

2) I basically open a csv file and read it all the text using

text_lines=f.readlines()

But will text_lines look exactly like in the csv file? I noted when I use print text_lines look jumbled up.

3) Is there a way to read in text_lines to look exactly like in the csv files so that my regex expression work?

Thank you