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2020/4/validate.d

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+import std.stdio;
+import std.file;
+import std.array;
+import std.uni : isWhite;
+
+void main() {
+	string contents = readText("input");
+	auto lines = contents.split("\n\n");
+	int good = 0;
+
+	foreach(i, line; lines) {
+		auto parts = line.split!(isWhite);
+
+		string[] items = [ "byr", "iyr", "eyr", "hgt", "hcl", "ecl", "pid" ];
+		int[string] totals;
+		foreach(y, item; items)
+			totals[item] = 0;
+
+		foreach(x, part; parts) {
+			auto fields = part.split(":");
+			if(fields.length < 2)
+				continue;
+
+			if(!(fields[0] in totals))
+				continue;
+
+			totals[fields[0]]++;
+		}
+
+		int sum = 0;
+		foreach(z, total; totals)
+			sum += total;
+
+		if(sum == items.length)
+			good++;
+	}
+
+	writefln("There are %d valid passports.", good);
+}

2020/4/validate2.d

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+import std.stdio;
+import std.file;
+import std.array;
+import std.uni : isWhite;
+import std.conv;
+import std.regex;
+
+void main() {
+	string contents = readText("input");
+	auto lines = contents.split("\n\n");
+	int good = 0;
+
+	foreach(i, line; lines) {
+		auto parts = line.split!(isWhite);
+
+		string[] items = [ "byr", "iyr", "eyr", "hgt", "hcl", "ecl", "pid" ];
+		int[string] totals;
+		foreach(y, item; items)
+			totals[item] = 0;
+
+		foreach(x, part; parts) {
+			auto fields = part.split(":");
+			if(fields.length < 2)
+				continue;
+
+			if(!(fields[0] in totals))
+				continue;
+			
+			if(part.matchAll(ctRegex!(r"^(pid:\d{9}|byr:(19[2-9]\d|200[0-2])|iyr:20(1\d|20)|eyr:20(2\d|30)|hgt:((59|6\d|7[0-6])in|(1[5-8]\d|19[0-3])cm)|hcl:#[0-9a-f]{6}|ecl:(amb|blu|brn|gry|grn|hzl|oth)|pid:\d{9}|cid:.*)$")))
+				totals[fields[0]]++;
+		}
+
+		int sum = 0;
+		foreach(z, total; totals)
+			sum += total;
+
+		if(sum == items.length)
+			good++;
+	}
+
+	writefln("There are %d valid passports.", good);
+}