POSIXRegex.cpp is a powerful lightweight C++ wrapper for the POSIX regex library commonly used in C, <regex.h>.
It is well known that <regex> has become a part of the C++ standard library with the advent of C++11. However, for various reasons, sometimes using C++11 regex is not possible (old compiler, legacy platform, etc.).
This project is an alternative for *nix users trapped with C++98 who want the syntactic sugar of python without the hassle of 3rd party regex libraries like Boost and PCRE.
Note: POSIXRegex probably won't compile out of the box on Windows, since Windows does not usually have POSIX libaries. It may or may not work under e.g. Cygwin.
However, it is very easy to compile under *nix:
g++ -c POSIXRegex.cpp
This yields POSIXRegex.o which can then be linked in with the target process.
example.cpp:
#include "POSIXRegex.h"
#include <iostream>
#include <string>
#include <vector>
using namespace std;
int main()
{
POSIX::Regex re;
POSIX::Match m;
re.compile("/hello/(.*)");
cout << "Matches? " << re.matches("/hello/darkness") << endl;
cout << "Matches? " << re.matches("/mello/darkness") << endl;
cout << endl;
re.compile("hello (\\w+) my old (\\w+)");
m = re.match("hello darkness my old mellon");
vector<string> groups = m.groups();
for (unsigned int i = 0; i < groups.size(); ++i)
cout << i << ": " << groups[i] << endl;
cout << endl;
re.compile("John (.*) is my (B.+)", true); //case insensitive
m = re.match("John Doe is my boy");
cout << m.group(0) << endl;
cout << m.group(1) << endl;
cout << m.group(2) << endl;
cout << endl;
m = re.match("John Smith is my Bizzle");
cout << "Total groups: " << m.numGroups() << endl;
cout << "Match start index: " << m.start(0) << endl;
cout << "Match end index: " << m.end(0) << endl;
cout << endl;
}
Run:
$ g++ example.cpp POSIXRegex.cpp
$ ./a.out
Matches? 1
Matches? 0
0: hello darkness my old mellon
1: darkness
2: mellon
John Doe is my boy
Doe
boy
Total groups: 3
Match start index: 0
Match end index: 23
$