- Plain Strings (207):
foo - Anchors (208):
k$ - Ranges (202):
[a-f]{4} - Backrefs (201):
(...).*\1 - Abba (193):
^(?!.*(.)(.)\2\1) - A man, a plan (176):
^(.)(.).*\2\1$ - Prime (286):
^(?!(..+)\1+$) - Four (199):
(.)(.\1){3} - Order (198):
^[^o].....?$ - Triples (589):
^[378][12479]|00($|[369]|1[25])|55|2[347] - Glob (397):
ai|c$|^p|[bcnrw][bnopr] - Balance (286):
^(<(<(<(<(<(<<>>)*>)*>)*>)*>)*>)*$ - Powers (80):
^(x|(xx){1,9}|x{32}|(x{64})+)$
Total Score: 3222
Did the first five myself, then collected the best answers I could find from others.