New subject: Boost-users Digest, Vol 3673, Issue 1

4 Jan 2014

      Hi Larry!

The error must be somewhere else in your code. The following program
behaves exactly as expected:

#include 
#include <string>
#include <iostream>

int main()
{
    boost::match_resultsstd::string::const_iterator match;
    boost::match_flag_type flags = boost::match_default;
    boost::regex re(std::string("^XXX_(\\d{3})_\\d{3}$"),
boost::regex::perl | boost::regex::icase);

    std::string the_text = "XXX_123_456";
    bool rc = boost::regex_search(the_text,match,re,flags);
    if (rc)
    {
        std::cout << "Number is " << match[1] << std::endl;
        return 0;
    }
    std::cout << "No match found" << std::endl;
    return 1;
}

---------

max@switters:~/tmp$ g++ test_regex.cpp -l boost_regex
max@switters:~/tmp$ ./a.out
Number is 123

Am 2014-01-03 18:00, schrieb boost-users-request@lists.boost.org:
...
Message: 1
Date: Thu, 2 Jan 2014 16:40:55 -0500
From: "Larry" 
To: 
Subject: [Boost-users] [Regex] Subexpression matching during search
Message-ID: 
Content-Type: text/plain; charset="utf-8"
I have probably missed something in the doc that answers my query but I just can?t see it.
This is using Perl syntax.
I had a regex:
^(XXX_\d{3,3})_\d{3,3}$
It compiles OK but does not match anything in a regex_search. If I remove the parenthesis
^XXX_\d{3,3}_\d{3,3}$
I get matches. Any clues as to what I am missing?
Extract of regex related code lines:
reg.regex = new boost::regex(reg.reg,boost::regex::perl | boost::regex::icase);
boost::match_resultsstring::const_iterator match;
        boost::match_flag_type flags = boost::match_default;
        std::string::const_iterator xstart, xend;
xrc = boost::regex_search(xstart,xend,match,*((*rgi).regex),flags);
Larry

Re: [Boost-users] Boost-users Digest, Vol 3673, Issue 1

Markus Lenger

Larry

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