Re: Using ascii numbers in regular expression
MRAB wrote:
You're almost there:
re.subn('\x61','b','')
or better yet:
re.subn(r'\x61','b','')
Wouldn't that becomes a literal \x61 instead of a as it is inside raw
string?
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Re: Using ascii numbers in regular expression
Lie Ryan wrote:
MRAB wrote:
You're almost there:
re.subn('\x61','b','')
or better yet:
re.subn(r'\x61','b','')
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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Using ascii numbers in regular expression
Hi, How can I use the ascii number of a character in a regular expression (module re) instead of the character itself? Thanks very much -- http://mail.python.org/mailman/listinfo/python-list
Re: Using ascii numbers in regular expression
Thanks very much for your reply.
What I mean is that I would like to use the ascii number in a regular
expression pattern.
For instance, if I want to substitute the occurrences of character 'a' for
the character 'b' in a string, instead of doing this:
re.subn('a','b','')
I'd like to specify the ascii number of a (which is 97)
I tried converting 97 to hexadecimal (with hex()) and tried this
re.subn(''\0x61,'b','')
but it doesnt work.
I need this because I'm working on non printable characters.
Thanks a lot
On Tue, Apr 28, 2009 at 12:45 PM, Chris Rebert c...@rebertia.com wrote:
On Tue, Apr 28, 2009 at 4:05 AM, jorma kala jjk...@gmail.com wrote:
Hi,
How can I use the ascii number of a character in a regular expression
(module re) instead of the character itself?
Thanks very much
I refer you to the chr() and ord() built-in functions, which can
certainly be used to solve your problem, though they are not
regex-specific in application.
http://docs.python.org/library/functions.html
Cheers,
Chris
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Re: Using ascii numbers in regular expression
On Tue, Apr 28, 2009 at 4:58 AM, jorma kala jjk...@gmail.com wrote:
Thanks very much for your reply.
What I mean is that I would like to use the ascii number in a regular
expression pattern.
For instance, if I want to substitute the occurrences of character 'a' for
the character 'b' in a string, instead of doing this:
re.subn('a','b','')
I'd like to specify the ascii number of a (which is 97)
I tried converting 97 to hexadecimal (with hex()) and tried this
You should go the more direct route, as my function recommendation implied:
assert chr(97) == a
re.subn(chr(97),'b','')
Cheers,
Chris
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Re: Using ascii numbers in regular expression
On Tue, Apr 28, 2009 at 4:05 AM, jorma kala jjk...@gmail.com wrote: Hi, How can I use the ascii number of a character in a regular expression (module re) instead of the character itself? Thanks very much I refer you to the chr() and ord() built-in functions, which can certainly be used to solve your problem, though they are not regex-specific in application. http://docs.python.org/library/functions.html Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Using ascii numbers in regular expression
jorma kala wrote:
Thanks very much for your reply.
What I mean is that I would like to use the ascii number in a regular
expression pattern.
For instance, if I want to substitute the occurrences of character 'a'
for the character 'b' in a string, instead of doing this:
re.subn('a','b','')
I'd like to specify the ascii number of a (which is 97)
I tried converting 97 to hexadecimal (with hex()) and tried this
re.subn(''\0x61,'b','')
but it doesnt work.
I need this because I'm working on non printable characters.
[snip]
You're almost there:
re.subn('\x61','b','')
or better yet:
re.subn(r'\x61','b','')
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