哪错了？这正则表达式没问题啊。一运行就terminal

#include<iostream>
#include<regex>
#include<string>
using namespace std;
int main()
{
regex r("([\\d]{3})([-. ])([\\d]{4})");
smatch results;
string word("1111-11111");
regex_match(word, results, r);
cout<< results.str(0);
return 0;
}