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 06:15:59

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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