Regex Golf Answers (http://regex.alf.nu/) HN: https://news.ycombinator.com/item?id=6941231
foo
k$
^[a-f]*$
(...).*\1
^(.(?!(ll|ss|mm|rr|tt|ff|cc|bb)))*$|^n|ef
^(.)[^p].*\1$
^(?!(..+)\1+$)
(.)(.\1){3}
^[^o].....?$
(^39|^44)|(^([0369]|([147][0369]*[258])|(([258]|[147][0369]*[147])([0369]*|[258][0369]*[147])([147]|[258][0369]*[258])))*$)
^((\*(er|f|i|p|t|v))|(b|c(h|o|r)|do|l|mi|p(a|r|u)|re|w))
^(<(<(<(<(<(<<>>)*>)*>)*>)*>)*>)*$
^((((((((((x)\10?)\9?)\8?)\7?)\6?)\5?)\4?)\3?)\2?)\1?$
Total Score: 3060