Simple slugify function for D

slugify.d

import std.stdio;
import std.uni;
import std.ascii;
import std.string;
import std.algorithm;
import std.range;

string slugify(string text) {
	text = normalize!NFKD(text);
	auto slug = "";

	auto lettersAndDigits = letters ~ digits;
	auto whitespace = ['-', ' ', '_'];
	foreach(v; text) {
		if(lettersAndDigits.canFind(v)) {
			slug ~= v;
		} else if (whitespace.canFind(v) && slug.back != '-') {
			slug ~= '-';
		}
	}
	return slug.toLower();
}

void main() {
}

unittest {
	assert(slugify("Du må ikke sove.") == "du-ma-ikke-sove");
}