Hello,
I have got a problem with the interpretation of the optionality
operator '?' in boost::regex. Consider the following example
(regex_test.cpp):
#include <iostream>
#include
int main ( int argc, char** argv )
{
boost::regex test ( "(Apple)? Iphone 3g" );
boost::match_resultsstd::string::const_iterator what;
std::string input ( argv[1] );
if ( 0 == boost::regex_match ( input, what, test,
boost::match_default | boost::match_partial ) )
{
std::cerr << "No Match\n";
}
if ( what[0].matched )
{
std::cerr << "Full Match\n";
}
else
{
std::cerr << "Partial Match\n";
}
return 0;
}
Test runs are:
./regex_test "Apple Iphone"
Output: Partial Match (as expected)
./regex_test "Apple Iphone 3g"
Output: Full Match (as expected)
./regex_test "Iphone"
Output: No Match and Partial Match (Why is that? "Apple" is optional
should only be "Partial Match")
./regex_test "Iphone 3g"
Output: No Match and Partial Match (Why is that? "Apple" is optional
should be "Full Match")
Probably, I am only missing a flag but tests with "\A" and friends do
not help. Any comments are appreciated. Many thanks in advance.
Cheers,
Kay
