1 files changed, 29 insertions, 0 deletions
diff --git a/04/b.rb b/04/b.rb
new file mode 100644
index 0000000..e2cd254
--- /dev/null
+++ b/04/b.rb
@@ -0,0 +1,29 @@
+file = File.read('input.txt')
+records = file.split "\n\n"
+
+fields = [ 'byr', 'iyr', 'eyr', 'hgt', 'hcl', 'ecl', 'pid' ]
+
+regexes = [
+  /^byr:(19[2-9]\d|200[0-2])$/,
+  /^iyr:(201\d|2020)$/,
+  /^eyr:(202\d|2030)$/,
+  /^hgt:((1[5-8]\d|19[0-3])cm|(59|6\d|7[0-6])in)$/,
+  /^hcl:#[0-9a-f]{6}$/,
+  /^ecl:(amb|blu|brn|gry|grn|hzl|oth)$/,
+  /^pid:\d{9}$/
+]
+
+count = 0
+records.each do |record|
+  fields_correct = 0
+  record.split.each do |entry|
+    if regexes.any? {|r| r.match?(entry)}
+      fields_correct += 1
+    end
+  end
+
+  if fields_correct == 7
+    count += 1
+  end
+end
+puts count