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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 setup_regex(self):
 """Regex definitions for parsing the code elements."""

        self._RX_INTERFACE = (r"\n\s*interface\s+(?P<name>[a-z0-9_]+)(\s\((?P<symbol>[.\w+*=/-]+)\))?"
                              r"(?P<contents>.+?)"
                              r"end\s*interface\s+(?P=name)?")
        self.RE_INTERFACE = re.compile(self._RX_INTERFACE, re.I | re.DOTALL)