Re: what would be the regular expression for null byte present in a string

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From	Peter Otten <__peter__@web.de>
Subject	Re: what would be the regular expression for null byte present in a string
Date	Tue, 13 Jan 2015 15:41:51 +0100
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Shambhu Rajak wrote:

> I have a string that I get as an output of a command as:
> 
'\x01\x00\x00\x00\x00\x00\x00\x00\x0c\x00\x00\x0010232ae8944a\x02\x00\x00\x00\x00\x00\x00\x00\n'
> 
> I want to fetch '10232ae8944a' from the above string.
> 
> I want to find a re pattern that could replace all the \x01..\x0z to be
> replace by empty string '',  so that I can get the desired portion of
> string
> 
> Can anyone help me with a working regex for it.

I think you want the str.tranlate() method rather than a regex. 

Assuming you are using Python 2:

>>> delenda = "".join(map(chr, range(32)))
>>> identity = "".join(map(chr, range(256)))
>>> 
'\x01\x00\x00\x00\x00\x00\x00\x00\x0c\x00\x00\x0010232ae8944a\x02\x00\x00\x00\x00\x00\x00\x00\n'.translate(identity, 
delenda)
'10232ae8944a'

With Python3:

>>> mapping = dict.fromkeys(range(32))
>>> 
'\x01\x00\x00\x00\x00\x00\x00\x00\x0c\x00\x00\x0010232ae8944a\x02\x00\x00\x00\x00\x00\x00\x00\n'.translate(mapping)
'10232ae8944a'

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Re: what would be the regular expression for null byte present in a string Peter Otten <__peter__@web.de> - 2015-01-13 15:41 +0100
  Re: what would be the regular expression for null byte present in a string Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-01-14 14:52 +0100
    Re: what would be the regular expression for null byte present in a string Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-01-14 15:11 +0100

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