使用Regex从具有已知前缀的字符串中提取多个单词

Question

我有以下输入

Obvious directions are:
west, east, southeast, south.

并且想要以下输出：

westeastsoutheastsouth

什么是神奇的正则表达式可以为我做到这一点？

我已经提取了第一个令牌west，所以我想我需要一个乘法器/递归器/什么的，但我一辈子都找不到什么。

(?<= Obvious directions are:s+)(w+)(?=[,.])

Answer 1

使用

(?<=Obvious directions are:[^.]*?)w+

见证明。

解释

--------------------------------------------------------------------------------
(?<=                     look behind to see if there is:
--------------------------------------------------------------------------------
Obvious directions       'Obvious directions are:'
are:
--------------------------------------------------------------------------------
[^.]*?                   any character except: '.' (0 or more
times (matching the least amount
possible))
--------------------------------------------------------------------------------
)                        end of look-behind
--------------------------------------------------------------------------------
w+                      word characters (a-z, A-Z, 0-9, _) (1 or
more times (matching the most amount
possible))