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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _compile_re(self, expression):
 """ Compile given regular expression for current sanitize words """

        meta_words = "|".join(self.sanitize_words)
        expression = expression.replace("META_WORDS_HERE", meta_words)
        return re.compile(expression, re.IGNORECASE)