How to use a variable inside a regular expression?

Question

I\'d like to use a variable inside a regex, how can I do this in Python?

TEXTO = sys.argv[1]

if re.search(r\"\\b(?=\\         


        

Answer 1

more example

I have configus.yml with flows files

"pattern":
  - _(\d{14})_
"datetime_string":
  - "%m%d%Y%H%M%f"

in python code I use

data_time_real_file=re.findall(r""+flows[flow]["pattern"][0]+"", latest_file)