python:二进制文件的正则表达式搜索模式(半字节) [英] python: regular expression search pattern for binary files (half a byte)

问题描述

我正在使用以下正则表达式模式在二进制文件中搜索0xDEAD4FAD:

I am using the following regular expression pattern for searching 0xDEAD4FAD in a binary file:

my_pattern = re.compile(b"\xDE\xAD\x4F\xAD")

但是如何概括搜索0xDEAD4xxx的搜索模式?似乎无法切入半个字节

but how do I generalize the search pattern for searching 0xDEAD4xxx? can't seem to cut through half a byte

推荐答案

正则表达式确实允许在范围内进行搜索.因此，要找到第一个半字节为"4"的字节，请使用:

Regular expressions do allow searching over ranges. Thus, to find a byte whose the first nibble is "4" use:

pattern = re.compile(b"[\x40-\x4F]")

以下测试表明它会产生所需的输出:

The following test shows that it produces the desired output:

>>> for byte in ('\x3f', '\x40', '\x42', '\x4f', '\x50'): print bool(pattern.search(byte))
... 
False
True
True
True
False

要回答有关搜索0xDEAD4xxx的特定问题，请使用:

To answer your specific question about searching for 0xDEAD4xxx, use:

my_pattern = re.compile(b"\xDE\xAD[\x40-\x4F].")

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