diff --git a/2020/4/regexes.txt b/2020/4/regexes.txt
new file mode 100644
index 0000000..dacaf67
--- /dev/null
+++ b/2020/4/regexes.txt
@@ -0,0 +1 @@
+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:#[[:xdigit:]]{6}|ecl:(amb|blu|brn|gry|grn|hzl|oth)|pid:\d{9}|cid:.*