RE: [Boost-Users] Problem with regular expression

From: James Zappia (James.Zappia_at_[hidden])
Date: 2003-07-23 15:21:23

You need to escape the backslash in your exp variable.  Here's (1) that
works.

#include <iostream>
#include <string>
#include <boost/regex.hpp>

using namespace std;
using namespace boost;

int main()
{
        regex exp("\\s(ab)*", regbase::perl); // note the escaped \s here
        cmatch what;

        if ( regex_match(" ababab", what, exp) )
        {
                string str = what[0];
                cout << str << endl;
        }
}

Regards,
James

-----Original Message-----
From: Javier de Acha [mailto:jdeacha_at_[hidden]] 
Sent: Wednesday, July 23, 2003 10:50 AM
To: Boost-Users_at_[hidden]
Subject: [Boost-Users] Problem with regular expression

Hello, 
The next few lines doesn't work (1) with \s. But (2) works well [[:space:]]

regbase::escape_in_lists dont func?

Someone it knows because? 

Thanks
Javier

---------------------------------------------------------------------
(1)
void main()
{ 
     regex exp("\s(ab)*",regbase::perl);

    cmatch what;
    if(regex_match(" ababab", what, exp))
    {  
        string str = what[0];   //this fail
     }
}
----------------------------------------------------------------------------
----
(2)
void main()
{ 
     regex exp("[[:space:]](ab)*",regbase::perl);
    cmatch what;
    if(regex_match(" ababab", what, exp))
    {  
        string str = what[0];   //this succesfully match
     }
}
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