Why is it different about '\s' Matches whitespace and Equivalent to [\t\n\r\f]?

MRAB python at mrabarnett.plus.com
Thu Jul 10 16:08:23 CEST 2014


On 2014-07-10 14:32, fl wrote:
> On Thursday, July 10, 2014 7:18:01 AM UTC-4, MRAB wrote:
>> It's equivalent to [ \t\n\r\f], i.e. it also includes a space, so
>> either the tutorial is wrong, or you didn't look closely enough. :-)
>>
>> The string starts with ' ', not '\t'.
>>
>> The string starts with ' ', which isn't in the character set.
>>
> The '\s' description is on link:
>
> http://www.tutorialspoint.com/python/python_reg_expressions.htm
>
I can see that the space is missing. It should say:

     \s    Matches whitespace. Equivalent to [ \t\n\r\f].

> Could you give me an example to use the equivalent pattern?
>
(I'm using Python 3.4, which is why the match object looks different.)

 >>> import re
 >>> re.match(r'\s*\d\d*$', '   111')
<_sre.SRE_Match object; span=(0, 6), match='   111'>
 >>> re.match(r'[ \t\n\r\f]*\d\d*$', '   111')
<_sre.SRE_Match object; span=(0, 6), match='   111'>




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