Scala-正则表达式，用于不确定的重复模式

Question

In Scala, I've a string inputs like

1. [[Country].[US]-[Country].[Canada]]
2. [[Country].[US]-[Country].[Canada]-[Country].[Mexico]]
3. [[Country].[US].[New York]-[Country].[US].[California]]

I need to extract following for above strings

1. [Country].[US], [Country].[Canada]
2. [Country].[US], [Country].[Canada], [Country].[Mexico]
3. [Country].[US].[New York], [Country].[US].[California]

They are random, separated by - (hyphen).

I need a regex that can match groups. I can make it work for static pattern, but don't know how to accommodate dynamic ones.

I can't split it with hyphen, as there can be another input containing negative integers, like

 [Rank].[-1]-[Rank].[1]-[Rank].[10] 

Answer 1

You can simply drop the first and last character and split by "-" :

def extractTokens(text: String) = text.drop(1).dropRight(1).split("-")

> extractTokens("[[Country].[US]-[Country].[Canada]]")
> Array([Country].[US], [Country].[Canada])

> extractTokens("[[Country].[US]-[Country].[Canada]-[Country].[Mexico]]")
> Array([Country].[US], [Country].[Canada], [Country].[Mexico])