Re: [Boost-users] boost 1.50 unable to make regex_match to work

Subject: Re: [Boost-users] boost 1.50 unable to make regex_match to work
From: John Maddock (jz.maddock_at_[hidden])
Date: 2016-10-27 07:55:05

On 27/10/2016 11:34, MAURICE Jean wrote:
> Hi John,
>
> In fact I am 'studying' an old app that I will have to 'upgrade'.
>
> I got the sources and the first step was to upgrade boost from 1.39 to 1.50.
>
> My client says : "on my computers (so with 1.39) it works". On my computer it doesn't. So I would like to understand why regex_match 1.39 works and not regex_match 1.50. But if you say that I MUST use regex_seach : it will be a huge work to do (the app is more than 250k lines of C++).
>
> I am trying regex_search on me small test program and I come back.

There should never have been any version of Boost where regex_match 
would match "GHI+" against "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".
>
> Jean
>
> -----Message d'origine-----
> De : Boost-users [mailto:boost-users-bounces_at_[hidden]] De la part de John Maddock
> Envoyé : jeudi 27 octobre 2016 12:16
> À : boost-users_at_[hidden]
> Objet : Re: [Boost-users] boost 1.50 unable to make regex_match to work
>
>
>
> On 27/10/2016 10:56, MAURICE Jean wrote:
>> 1)Hi Kai, I wrote
>>
>>     const_iterator BOOST_REGEX_CALL end()const
>>
>> {
>>
>> // JME 27/10/16 pour savoir si on passe là, je crée une division par 0
>> en
>>
>> // esperant que le compilateur ne la détecte pas
>>
>> int ijme1, ijme2;
>>
>>        ijme2 = 1;
>>
>>        ijme1 = 2;
>>
>>        --ijme2;
>>
>>        ijme1 = ijme1 / ijme2;
>>
>> return (!this->m_status ? 0 : this->m_expression +
>> this->m_expression_len);
>>
>> // return (this->m_status ? 0 : this->m_expression +
>> this->m_expression_len);  JME 26/10/16
>>
>>     }
>>
>> Hoping the divide by 0 error would be thrown but it never appears. So
>> I don't think this bug is annoying me.
>>
>> 2)As I am new to boost and regex I tried a simple test :
>>
>>        string pattern = "GHI+";
>>
>>        string chaineatester = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
>>
>>        boost::regex boost_pattern( pattern );
>>
>> boost::smatch  what;
>>
>> int errjme = boost::regex_match( chaineatester, what, boost_pattern );
>>
>> if(errjme == 1)
>>
>>        {
>>
>>              *outputLog << "test 1: GHI+ a été trouvé" << endl;
>>
>>        }
>>
>> else
>>
>>        {
>>
>>              *outputLog << "test 1: GHI+ n'a pas été trouvé" << endl;
>>
>> // what[0] contains the whole string
>>
>> // what[1] contains the response code
>>
>> // what[2] contains the separator character
>>
>> // what[3] contains the text message.
>>
>> *outputLog << "  what[0]:" << what[0] << endl \
>>
>>                    << "  what[1]:" << what[1] << endl \
>>
>>                    << "  what[2]:" << what[2] << endl \
>>
>>                    << "  what[3]:" << what[3] << endl;
>>
>>        }
>>
>>        string pattern2 = "GHI";
>>
>>        boost::regex boost_pattern2( pattern2 );
>>
>>        errjme = boost::regex_match( chaineatester, what, boost_pattern2
>> );
>>
>> if(errjme == 1)
>>
>>        {
>>
>>              *outputLog << "test 1bis: GHI a été trouvé" << endl;
>>
>>        }
>>
>> else
>>
>>        {
>>
>>              *outputLog << "test 1bis: GHI n'a pas été trouvé" << endl;
>>
>>              *outputLog << "  what[0]:" << what[0] << endl \
>>
>>                    << "  what[1]:" << what[1] << endl \
>>
>>                    << "  what[2]:" << what[2] << endl \
>>
>>                    << "  what[3]:" << what[3] << endl;
>>
>>        }
>>
>>                  And here is what I get :
>>
>> test 1: GHI+ n'a pas été trouvé
>>
>> what[0]:
>>
>>    what[1]:
>>
>>    what[2]:
>>
>>    what[3]:
>>
>> test 1bis: GHI n'a pas été trouvé
>>
>>    what[0]:
>>
>>    what[1]:
>>
>>    what[2]:
>>
>>    what[3]:
>>
>> What am I doing wrong ?
>>
> I believe the algorithm you are looking for is regex_search, please see the docs for the difference between the two.
>
> HTH, John.
>
>> Jean
>>
>>
>>
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