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31 lines
1.2 KiB
Python
31 lines
1.2 KiB
Python
# This file is Copyright 2019 Volatility Foundation and licensed under the Volatility Software License 1.0
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# which is available at https://www.volatilityfoundation.org/license/vsl-v1.0
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#
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import re
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from typing import Generator, List, Tuple
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class MultiRegexp(object):
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"""Algorithm for multi-string matching."""
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def __init__(self) -> None:
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self._pattern_strings = [] # type: List[bytes]
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self._regex = re.compile(b'')
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def add_pattern(self, pattern: bytes) -> None:
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self._pattern_strings.append(pattern)
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def preprocess(self) -> None:
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if not self._pattern_strings:
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raise ValueError("No strings to compile into a regular expression")
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self._regex = re.compile(b'|'.join(map(re.escape, self._pattern_strings)))
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def search(self, haystack: bytes) -> Generator[Tuple[int, bytes], None, None]:
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if not isinstance(haystack, bytes):
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raise TypeError("Search haystack must be a byte string")
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if not self._regex.pattern:
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raise ValueError("MultiRegexp cannot be used with an empty set of search strings")
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for match in re.finditer(self._regex, haystack):
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yield (match.start(0), match.group())
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