reg exp and octal notation

[Ruud de Jong]

Lucas Branca schreef:
> Could someone explain me the difference between the results below?
> 
> ## $cat octals.txt
> ## \006\034abc
> 
> import re
> 
> a= "\006\034abc"
> preg= re.compile(r'([\0-\377]*)')
> res = preg.search(a)
> print res.groups()
> 
> loader = open('./octals.txt', 'r')
> b = loader.readline()

Look at the value of b at this point, you'll see:
 >>> b
'\\006\\034abc\n'

In other words, the backslashes are seen as literal backslashes.
readline() does no evaluation of the string, it just copies the
characters.

Regards,

Ruud

> preg= re.compile(r'([\0-\377]*)')
> res = preg.search(b)
> print res.groups()
> 
> 
> RESULTS
> 
> ('\x06\x1cabc',)
> 
> ('\\006\\034abc\n',)
> 
> 
> Many thanks
> Lucas
> 
>