$re = '/^\s*(enum[^{]*)\s*({)\s*([^}]+)\s*(};)/ms';
$str = '#include <iostream>
// enum that takes 16 bits
enum smallenum: int16_t
{
a,
b,
c
};
// color may be red (value 0), yellow (value 1), green (value 20), or blue (value 21)
enum color
{
red,
yellow,
green = 20,
blue
};
// altitude may be altitude::high or altitude::low
enum class altitude: char
{
high=\'h\',
low=\'l\', // C++11 allows the extra comma
};
// the constant d is 0, the constant e is 1, the constant f is 3
enum
{
d,
e,
f = e + 2
};
//enumeration types (both scoped and unscoped) can have overloaded operators
std::ostream& operator<<(std::ostream& os, color c)
{
switch(c)
{
case red : os << "red"; break;
case yellow: os << "yellow"; break;
case green : os << "green"; break;
case blue : os << "blue"; break;
default : os.setstate(std::ios_base::failbit);
}
return os;
}
std::ostream& operator<<(std::ostream& os, altitude al)
{
return os << static_cast<char>(al);
}
int main()
{
color col = red;
altitude a;
a = altitude::low;
std::cout << "col = " << col << \'\\n\'
<< "a = " << a << \'\\n\'
<< "f = " << f << \'\\n\';
}';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php