diff --git a/04/04_refactored.py b/04/04_refactored.py
new file mode 100644
index 0000000..e85423a
--- /dev/null
+++ b/04/04_refactored.py
@@ -0,0 +1,33 @@
+import re
+
+def read_file():
+	passports = [] 
+	with open("input.txt","r") as f:
+		raw_passports = f.read().strip().split('\n\n')
+	for passport in raw_passports:
+		parts = re.split('\s', passport)
+		passport_dict = dict(part.split(':') for part in parts) # use dictionary comprehension
+		passports.append(passport_dict)
+	return passports
+
+validators = {
+	'byr': lambda x: len(x) == 4 and 2002 >= int(x) >= 1920,
+	'iyr': lambda x: len(x) == 4 and 2020 >= int(x) >= 2010,
+	'eyr': lambda x: len(x) == 4 and 2030 >= int(x) >= 2020,
+	'hgt': lambda x: (x[-2:] == 'cm' and 150 <= int(x[:-2]) <= 193) or (x[-2:] == 'in' and 59 <= int(x[:-2]) <= 76),
+	'hcl': lambda x: re.match('^#[\da-f]{6}$', x) != None,
+	'ecl': lambda x: x in ['amb','blu','brn','gry','grn','hzl','oth'],
+	'pid': lambda x: len(x) == 9  and x.isdigit(),
+}
+
+def main():
+	part1 = part2 = 0
+	passports = read_file()
+	for passport in passports:
+		if all(key in passport for key in validators): # TIL all() checks for iterable conditions
+			part1 += 1
+			if all(validators[key](passport[key]) for key in validators): # apply validators as function
+				part2 += 1
+	print(f'{part1=} {part2=}')
+if __name__ == "__main__":
+	main()
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