问为C++运行一次返回多个模式的所有匹配项的正则表达式库？

EN

string text = "abcd abce abcd";

static const sregex abcd = as_xpr("abcd");  // static - faster
sregex abce = sregex::compile( "abce" )  // compiled 
sregex all = *(keep(abcd) | keep(abce));

smatch what;

if( regex_match( text, what, all ) ) 
{
    smatch::nested_results_type::const_iterator begin = what.nested_results().begin();
    smatch::nested_results_type::const_iterator end = what.nested_results().end();

    for(;it != end; it++)
    {
        if(it->regex_id() == abcd.regex_id())
        {
            // you match abcd
            // use it->begin() and it->end()
            // or it->position() and it->length()
            continue;
        }
        if(it->regex_id() == abce.regex_id())
        {
            // you match abcd...
            continue;
        };

}

"abcd|abcd"