Python: How to use a variable inside a regular expression?

 python - How to use a variable inside a regular expression? - Stack Overflow

You have to build the regex as a string:

TEXTO = sys.argv[1]
my_regex = r"\b(?=\w)" + re.escape(TEXTO) + r"\b(?!\w)"

if re.search(my_regex, subject, re.IGNORECASE):
    etc.

Note the use of re.escape so that if your text has special characters, they won't be interpreted as such.