alias for regular expressions

[Meta via Digitalmars-d-learn]

On Sunday, 13 September 2015 at 19:52:20 UTC, Thunderbird wrote:
> Thanks for your quick reply :)

To expand on that, alias in D is nothing like the C macro 
preprocessor. D specifically disallows tricks like `#define true 
false`. In D, aliases are just another name for a symbol. Ex:

struct Test
{
     int n;
     float f;
}

alias IntFloat = Test; //IntFloat is just another name for Test

Test t = Test(0, 1.0);
IntFloat inf = IntFloat(0, 1.0);

//Test and IntFloat are NOT separate types.
//Use std.typecons.Typedef for that
assert(t == inf);
assert(is(typeof(t) == typeof(inf));