{

try{

std::regex e(re, (icase ? std::regex::ECMAScript | std::regex::icase : std::regex::ECMAScript));

std::smatch what;

boost::timer tim;

int iter = 1;

int counter, repeats;

double result = 0;

double run;

do

{

tim.restart();

for(counter = 0; counter < iter; ++counter)

{

std::regex_match(text, what, e);

}

result = tim.elapsed();

iter *= 2;

}while(result < 0.5);

iter /= 2;

// repeat test and report least value for consistency:

for(repeats = 0; repeats < REPEAT_COUNT; ++repeats)

{

tim.restart();

for(counter = 0; counter < iter; ++counter)

{

std::regex_match(text, what, e);

}

run = tim.elapsed();

result = (std::min)(run, result);

}

return result / iter;

}

catch(const std::exception& e)

{

std::cout << "Exception: " << e.what() << std::endl;

return -1;

}

{

void operator()( std::smatch const & ) const

{

}

{

try{

std::regex e(re, (icase ? std::regex::ECMAScript | std::regex::icase : std::regex::ECMAScript));

std::smatch what;

boost::timer tim;

int iter = 1;

int counter, repeats;

double result = 0;

double run;

do

{

tim.restart();

for(counter = 0; counter < iter; ++counter)

{

std::sregex_iterator begin( text.begin(), text.end(), e ), end;

std::for_each( begin, end, noop() );

//std::regex_grep(&dummy_grep_proc, text, e);

}

result = tim.elapsed();

iter *= 2;

}while(result < 0.5);

iter /= 2;

if(result >10)

return result / iter;

// repeat test and report least value for consistency:

for(repeats = 0; repeats < REPEAT_COUNT; ++repeats)

{

tim.restart();

for(counter = 0; counter < iter; ++counter)

{

std::sregex_iterator begin( text.begin(), text.end(), e ), end;

std::for_each( begin, end, noop() );

//std::regex_grep(&dummy_grep_proc, text, e);

}

run = tim.elapsed();

result = (std::min)(run, result);

}

return result / iter;

}

catch(const std::exception& e)

{

std::cout << "Exception: " << e.what() << std::endl;

return -1;

}