> Put simply, it doesn't occur often enough to be worth it. The cost
> outweighs the potential benefit.
I don't buy it. You could backtrack instead of failing for \b+ and
\b*, and it would be almost as fast as this optimization.
-- Devin
On Tue, Jan 3, 2012 at 1:57 PM, MRAB wrote:
> On 03/01/20
On 03/01/2012 09:45, Devin Jeanpierre wrote:
\\b\\b and \\b{2} aren't equivalent ?
This sounds suspiciously like a bug!
Why the wording is "should never" ? Repeating a zero-width assertion is not
forbidden, for instance :
import re
re.compile("\\b\\b\w+\\b\\b")
<_sre.SRE_Pattern obje
> \\b\\b and \\b{2} aren't equivalent ?
This sounds suspiciously like a bug!
> Why the wording is "should never" ? Repeating a zero-width assertion is not
> forbidden, for instance :
>
import re
re.compile("\\b\\b\w+\\b\\b")
> <_sre.SRE_Pattern object at 0xb7831140>
I believe this
The regular expression HOWTO
(http://docs.python.org/howto/regex.html#more-metacharacters) explains
the following
# --
zero-width assertions should never be repeated, because if they match
once at a given location, they can obviously be matched an infinite
number o
