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import re class RegexFilter(object): def __init__(self, pattern, replacement): self._pattern = pattern self._replacement = replacement self._regex = None def filter_text(self, text): regex = self._get_regex() filtered_text = regex.subn(self._replacement, text) return filtered_text[0] def _get_regex(self): if self._regex is None: self._regex = re.compile(self._pattern) return self._regex