1 files changed, 68 insertions, 0 deletions

diff --git a/2020/day4/passport.pl b/2020/day4/passport.pl
new file mode 100644
index 0000000..26c6e32
--- /dev/null
+++ b/2020/day4/passport.pl
@@ -0,0 +1,68 @@
+use strict;
+use warnings;
+use Smart::Comments;
+use DDP;
+
+my $batch;
+{
+    local $/;
+    open my $fh, '<', "input" or die "no input present, $!";
+    $batch = <$fh>;
+}
+
+my $valid = 0;
+
+# the file has to end with a empty line...
+while ($batch =~ m/((?:[^\n][\n]?)+)/gm ) {
+    my $person_passport = $1;
+    my %passport;
+
+    if ($person_passport =~ m/byr:(?<byr>\d{4})\s/) {
+        if ($+{byr} >= 1920 and $+{byr} <= 2002) {
+            $passport{"byr"} = $+{byr};
+        }
+    }
+
+    if ($person_passport =~ m/iyr:(?<iyr>\d{4})\s/) {
+        if ($+{iyr} >= 2010 and $+{iyr} <= 2020) {
+            $passport{"iyr"} = $+{iyr};
+        }
+    }
+
+    if ($person_passport =~ m/eyr:(?<eyr>\d{4})\s/) {
+        if ($+{eyr} >= 2020 and $+{eyr} <= 2030) {
+            $passport{"eyr"} = $+{eyr};
+        }
+    }
+
+    if ($person_passport =~ m/hgt:(?<hgt>\d+)(?<unit>\w{2})\s/) {
+        if ($+{unit} eq "cm") {
+            if ($+{hgt} >= 150 and $+{hgt} <= 193) {
+                $passport{"hgt"} = "$+{hgt}" . $+{unit};
+            }
+        } elsif ($+{unit} eq "in") {
+            if ($+{hgt} >= 59 and $+{hgt} <= 76) {
+                $passport{"hgt"} = "$+{hgt}" . $+{unit};
+            }
+        }
+    }
+
+    if ($person_passport =~ m/hcl:(?<hcl>#[a-f0-9]{6})\s/) {
+        $passport{"hcl"} = $+{hcl};
+    }
+
+    if ($person_passport =~ m/ecl:(?<ecl>amb|blu|brn|gry|grn|hzl|oth)\s/) {
+        $passport{"ecl"} = $+{ecl};
+    }
+
+    if ($person_passport =~ m/pid:(?<pid>[0-9]{9})\s/) {
+        $passport{"pid"} = $+{pid};
+    }
+
+    if (keys %passport == 7) {
+        $valid++;
+        $valids{$passport{"pid"}} = \%passport;
+    }
+}
+
+print("$valid");