Using ascii numbers in regular expression
MRAB
google at mrabarnett.plus.com
Thu Apr 30 10:13:02 EDT 2009
Lie Ryan wrote:
> MRAB wrote:
>> You're almost there:
>>
>> re.subn('\x61','b','aaaa')
>>
>> or better yet:
>>
>> re.subn(r'\x61','b','aaaa')
>
> Wouldn't that becomes a literal \x61 instead of "a" as it is inside raw
> string?
>
Yes. The re module will understand the \x sequence within a regular
expression.
The reason I say that the second solution is better is because you say:
"How can I use the ascii number of a character in a regular expression
(module re) instead of the character itself?"
Certain characters have a special meaning in regular expressions, eg
'*', so if you tried to search for '*' (or '\x2A') you would get an
exception. The solution would be to search for r'\*' or r'\x2A'.
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