c++11 regex - finding all matches between two slash chars - regex

Question

Lets assume I have a string like: String1/String2/String3/String4
I'd like to use regex to find every matching between slash characters + everything after the last / character. so the output would be: String2 , String3 , String4
smatch match_str;
regex re_str("\\/(.*)");
regex_match( s, match_str, re_str );
cout << match_str[1] << endl;
cout << match_str[2] << endl;
cout << match_str[3] << endl;

Answer 1

Note that regex_match requires a full string match. Also, .* matches 0 or more characters other than a newline, as many as possible (that is, it matches until the very end of the given line).
Also, / symbol in a C++ regex does not need to be escaped.
Here is a working code:
#include <string>
#include <iostream>
#include <regex>
using namespace std;
int main() {
std::regex r("[^/]+");
std::smatch m;
std::string s = "String1/String2/String3/String4";
for(std::sregex_iterator i = std::sregex_iterator(s.begin(), s.end(), r);
i != std::sregex_iterator();
++i )
{
std::smatch m = *i;
std::cout << m[0] << '\n';
}
return 0;
}
See IDEONE demo
Results:
String1
String2
String3
String4
If you need to specify the initial boundary, use
std::regex rex1("(?:^|/)([^/]+)");
The values will be inside m[1] then, rather than in m[0]. See another demo.

Answer 2

You can use this one:
\\/([^\\/])*
With a live example

Answer 3

Here is a way to do it using string iterators (untested).
std::string strInput = "String1/String2/String3/String4";
std::string::const_iterator start = strInput.begin();
std::string::const_iterator end = strInput.end();
std::smatch _M;
std::regex Rx( "/([^/]*)" );
while ( regex_search( start, end, _M, Rx ) )
{
std::string strSubDir = _M[1].str(); // Do something with subdir
cout << strSubDir.c_str() << endl; // Debug print subdir
start = _M[0].second; // Advance the start iterator past this match
}
Output:
String2
String3
String4