How to Integrate Variables into Python Regular Expressions?

How to Integrate Variables into Regular Expressions

Regular expressions provide a potent tool for pattern matching and parsing text data. Occasionally, you may need to incorporate dynamic variables into your regular expressions. In Python, this can be effortlessly accomplished.

To embed a variable within a regular expression, construct it as a string. Consider the scenario where you wish to check for the existence of a string represented by a variable called TEXTO inside the subject string while ignoring case. To achieve this:

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

if re.search(my_regex, subject, re.IGNORECASE):
    # Successful match
else:
    # Match attempt failed

In this code, the regular expression is built as a string using the " " operator. re.escape(TEXTO) ensures that any special characters within TEXTO are interpreted literally, preventing them from affecting the pattern matching process.

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