Why are homepage examples too complicated?

[Karabuta via Digitalmars-d]

I assume the purpose for those demonstrations are to win the 
interest of the user as to how easy and clean D code can be. Then 
why;

// Round floating point numbers
import std.algorithm, std.conv, std.functional,
     std.math, std.regex, std.stdio;

alias round = pipe!(to!real, std.math.round, to!string);
static reFloatingPoint = ctRegex!`[0-9]+\.[0-9]+`;

void main()
{
     // Replace anything that looks like a real
     // number with the rounded equivalent.
     stdin
         .byLine
         .map!(l => l.replaceAll!(c => c.hit.round)
                                 (reFloatingPoint))
         .each!writeln;
}

How is a new visitor supposed to know "!" is for templates and 
not some complicated syntax?