Regex Golf 练习记录

1.Warmup: foo
2.Anchors: k$ 或 ick$
3.It never ends: fu\b
4.Ranges: ^[a-f]*$ 或 [a-f]{4}
5.Backrefs:(...).*\1
6.Abba: ^(?!.*(.)(.)\2\1)
7.A man, a plan: ^(.)(.).*\2\1$ 或 ^(.)[^p].*\1$ 或 (.)(.).?\2\1.?$
8.Prime: ^(?!(xx+?)\1+$) 或  ^(?!(..+)\1+$)
9.Four: (.)(.\1){3} 
10.Order: ^.{5}[^e]?$
11.Triples: 00($|3|6|9|12|15)|4.2|.1.+4|55|.17
12.Glob: ai|c$|^p|[bcnrw][bnopr]
13.Balance: ^(<(<(<(<(<(<<>>)*>)*>)*>)*>)*>)*$
14.Powers: ^(?!(.(..)+)\1*$)
15.Long count: ^((.+)0 \2+1 ?)*$
16.Alphabetical: .r.{32}r|a.{10}te|n.n..
17.Powers2: ^((x+)\2(?=\2$))*x$