Re: [Boost-users] [regex] problem w/ regex::extended

Subject: Re: [Boost-users] [regex] problem w/ regex::extended
From: U.Mutlu (for-gmane_at_[hidden])
Date: 2015-02-16 10:50:57

Mark R Stallard wrote, On 02/16/2015 02:57 PM:
>
> U. Mutlu <for-gmane_at_[hidden]> wrote:
>
>> Thank you.
>> But on the "POSIX Extended Regular Expression Syntax" page
>> the escape sequence \w is very well listed:
>
> I should have explained this more thoroughly. I did not say
> that POSIX does not support \w at all.  What I said was:
>
>> I suspected that Perl would support the escape sequence \w
>> inside a [] character set, but POSIX extended might not.
>> The tests I ran affirmed those suspicions.
>
> POSIX extended supports \w, but NOT inside a [] character set.
> For POSIX extended, the regex [\w\-\.~/]+ is the same as
> [w\-\.~/]+.  Inside of [], POSIX extended sees \w as a
> literal "w".

Ok, I see, then one better should (generally) use the equivalent, [[:word:]], 
inside [].
Thx for clarification.

cu
Uenal

>
> You can test this yourself if you have an up-to-date version
> of the egrep shell command.
>
> |+|  M a r k  |+|
>
>    Mark Stallard
>    Business Application Services
>    Global Business Services Information Technology
>    Raytheon Company