if ((gcnew Regex("[A-Z][a-z]+"))->IsMatch("Hello")) Console::WriteLine("ok");

using namespace System;
using namespace System::Text::RegularExpressions;

int main()
{
if ((gcnew Regex("[A-Z][a-z]+"))->IsMatch("Hello")) Console::WriteLine("ok");
}

if (Regex::IsMatch("Hello", "[A-Z][a-z]+")) Console::WriteLine("ok");

using namespace System;
using namespace System::Text::RegularExpressions;

int main()
{
if (Regex::IsMatch("Hello", "[A-Z][a-z]+")) Console::WriteLine("ok");
}

Regex^ rx = gcnew Regex("[A-Z][a-z]+");
if (rx->IsMatch("Hello")) Console::WriteLine("ok");

using namespace System;
using namespace System::Text::RegularExpressions;

int main()
{
Regex^ rx = gcnew Regex("[A-Z][a-z]+");
if (rx->IsMatch("Hello")) Console::WriteLine("ok");
}

cmatch what;
if (regex_match("Hello", what, regex("[A-Z][a-z]+")))
cout << "ok" << endl;

// must link with either boost_regex or boost_regex-mt (multithread-safe version)

#include <iostream>
#include <boost/regex.hpp>

using namespace std;
using namespace boost;

int main()
{
cmatch what;
if (regex_match("Hello", what, regex("[A-Z][a-z]+")))
cout << "ok" << endl;
}