R：提取括号内的字符串/数字以及方括号内的字符串序列

Question

我在将数据分成两列或三列时遇到了一些问题。

以下是我想要处理以下列的字符串

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

我该怎么做才能将它分成两列：

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

以类似的方式， 我怎么能分开以下字符串？

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

成：

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

任何善于正常表达的人，请帮帮我！

谢谢！

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]]