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?

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