Can't seem to use this function in the Boost library - c++

Question

I'm working on a program that uses the Boost regular expressions library, and I'm running into an issue where while trying to call the boost::regex_match() function, I'm getting a strange error that I've never encountered before. Here is the relevant code.
boost::regex pattern("REGEX REDACTED");
boost::cmatch what;
XERCES_STD_QUALIFIER cout << "Enter XML Document-Building Commands" << XERCES_STD_QUALIFIER endl;
while(true) {
// Take the input from the user.
std::string input;
XERCES_STD_QUALIFIER cout << ">> ";
XERCES_STD_QUALIFIER getline(in, input);
if(boost::regex_match(input, what, pattern)) {
// whatever
}
}
This is almost exactly what I took out of example code from a similar program my instructor provided for this assignment. But when I try to compile, I get this error. If it helps, I'm using NetBeans 8.
XMLDoc.cpp: In member function ‘void XMLDoc::createDoc(std::istream&)’:
XMLDoc.cpp:164:51: error: no matching function for call to ‘regex_match(std::string&, boost::cmatch&, boost::regex&)’
XMLDoc.cpp:164:51: note: candidates are:
In file included from /usr/include/boost/regex/v4/regex.hpp:145:0,
from /usr/include/boost/regex.hpp:31,
from XMLDoc.cpp:13:
/usr/include/boost/regex/v4/regex_match.hpp:44:6: note: template<class BidiIterator, class Allocator, class charT, class traits> bool boost::regex_match(BidiIterator, BidiIterator, boost::match_results<Iterator, Allocator>&, const boost::basic_regex<charT, traits>&, boost::regex_constants::match_flag_type)
/usr/include/boost/regex/v4/regex_match.hpp:44:6: note: template argument deduction/substitution failed:
XMLDoc.cpp:164:51: note: deduced conflicting types for parameter ‘BidiIterator’ (‘std::basic_string<char>’ and ‘boost::match_results<const char*>’)
In file included from /usr/include/boost/regex/v4/regex.hpp:145:0,
from /usr/include/boost/regex.hpp:31,
from XMLDoc.cpp:13:
/usr/include/boost/regex/v4/regex_match.hpp:53:6: note: template<class iterator, class charT, class traits> bool boost::regex_match(iterator, iterator, const boost::basic_regex<charT, traits>&, boost::regex_constants::match_flag_type)
/usr/include/boost/regex/v4/regex_match.hpp:53:6: note: template argument deduction/substitution failed:
XMLDoc.cpp:164:51: note: deduced conflicting types for parameter ‘iterator’ (‘std::basic_string<char>’ and ‘boost::match_results<const char*>’)
In file included from /usr/include/boost/regex/v4/regex.hpp:145:0,
from /usr/include/boost/regex.hpp:31,
from XMLDoc.cpp:13:
/usr/include/boost/regex/v4/regex_match.hpp:68:13: note: template<class charT, class Allocator, class traits> bool boost::regex_match(const charT*, boost::match_results<const charT*, Allocator>&, const boost::basic_regex<charT, traits2>&, boost::regex_constants::match_flag_type)
/usr/include/boost/regex/v4/regex_match.hpp:68:13: note: template argument deduction/substitution failed:
XMLDoc.cpp:164:51: note: mismatched types ‘const charT*’ and ‘std::basic_string<char>’
In file included from /usr/include/boost/regex/v4/regex.hpp:145:0,
from /usr/include/boost/regex.hpp:31,
from XMLDoc.cpp:13:
/usr/include/boost/regex/v4/regex_match.hpp:77:13: note: bool boost::regex_match(const std::basic_string<charT, ST, SA>&, boost::match_results<typename std::basic_string<charT, ST, SA>::const_iterator, Allocator>&, const boost::basic_regex<charT, traits>&, boost::regex_constants::match_flag_type) [with ST = std::char_traits<char>; SA = std::allocator<char>; Allocator = std::allocator<boost::sub_match<const char*> >; charT = char; traits = boost::regex_traits<char>; typename std::basic_string<charT, ST, SA>::const_iterator = __gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >; boost::regex_constants::match_flag_type = boost::regex_constants::_match_flags]
/usr/include/boost/regex/v4/regex_match.hpp:77:13: note: no known conversion for argument 2 from ‘boost::cmatch {aka boost::match_results<const char*>}’ to ‘boost::match_results<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::allocator<boost::sub_match<const char*> > >&’
/usr/include/boost/regex/v4/regex_match.hpp:85:13: note: template<class charT, class traits> bool boost::regex_match(const charT*, const boost::basic_regex<charT, traits>&, boost::regex_constants::match_flag_type)
/usr/include/boost/regex/v4/regex_match.hpp:85:13: note: template argument deduction/substitution failed:
XMLDoc.cpp:164:51: note: mismatched types ‘const charT*’ and ‘std::basic_string<char>’
In file included from /usr/include/boost/regex/v4/regex.hpp:145:0,
from /usr/include/boost/regex.hpp:31,
from XMLDoc.cpp:13:
/usr/include/boost/regex/v4/regex_match.hpp:94:13: note: template<class ST, class SA, class charT, class traits> bool boost::regex_match(const std::basic_string<charT, ST, SA>&, const boost::basic_regex<charT, traits>&, boost::regex_constants::match_flag_type)
/usr/include/boost/regex/v4/regex_match.hpp:94:13: note: template argument deduction/substitution failed:
XMLDoc.cpp:164:51: note: ‘boost::cmatch {aka boost::match_results<const char*>}’ is not derived from ‘const boost::basic_regex<charT, traits>’
Can someone help me out here? I'm certain I included the library properly because I have another project with the exact same Linker properties that uses the boost::regex_match function (minus the cmatch object parameter), and it works just fine.

Answer 1

If you're going to use a std::string input, you have to use boost::smatch instead of boost::cmatch. See http://www.boost.org/doc/libs/1_57_0/libs/regex/doc/html/boost_regex/ref/match_results.html. So all you need to do is change
boost::cmatch what;
to
boost::smatch what;