R：提取括號內的字符串/數字以及方括號內的字符串序列

Question

我在將數據分成兩列或三列時遇到了一些問題。

以下是字符串，我想處理下一列

station "Park Rd & Holmead Pl NW (31602)" 

我能做些什麼把它分成兩列：， 怎麼可能

station address "Park Rd & Holmead Pl NW "    
station number 31602 

以類似的方式我分開以下字符串？

station "Park Rd & Holmead Pl NW (formerly 34th & Water St NW)" 

到：

station   "Park Rd & Holmead Pl NW"       
former station "34th & Water St NW" 

任何人誰是很好的正則表達式，請幫助我！

謝謝！

Answer 1

# question 1 
x <- "Park Rd & Holmead Pl NW (31602)" 
strsplit(x, "\\(|)$")[[1]] 

# question 2 
x <- "Park Rd & Holmead Pl NW (formerly 34th & Water St NW)" 
strsplit(x, "\\(formerly |)$")[[1]]