#include <cassert>
#include <cstring> // strlen
#include <string>
#include <boost/regex.hpp>


int main()
{
static boost::regex re("^\\s*(\\S+)");	// My RE
boost::smatch match;
std::string comm = "abcd";	// the input string

	if(boost::regex_search(comm, match, re)) {
		comm = match.suffix();	// eat the matched word
		std::string word(match.str(1));	// get the matched word
		assert(strlen(word.c_str()) > 0); // ASSERTION FAILS!!!
		// "word" should be "abcd", gdb output:
		//  (gdb) p word
		//  $1 = "\000bcd"
	}
}