Question

我有一个字符串，想要在:的两边提取文字。当然，正则表达式和gsub在这里会有所帮助。不幸的是，我的正则表达式技能往往为零。有人可以帮忙吗？

line <- "Mrs. Villiers: I assure my right hon. Friend that I shall come to that in due course. I have great sympathy with his observation."

结果应该是两个对象（如果在多个步骤中实现它并不重要）：

mrs 
"Mrs. Villiers"

text
"I assure my right hon. Friend that I shall come to that in due course. I have great sympathy with his observation."

Answer 1

我们可以使用strsplit

strsplit(line, ':\\s*')[[1]]
#[1] "Mrs. Villiers"                                                                                                     
#[2] "I assure my right hon. Friend that I shall come to that in due course. I have great sympathy with his observation."

或另一个选项是scan

trimws(scan(text=line, sep=':', what=''))

正如@AnandaMahto在评论中提到的，scan也有strip.white参数

scan(text=line, sep=':', what='', strip.white=TRUE)

Answer 2

只需使用strsplit：

strsplit(line,": ")[[1]]
# [1] "Mrs. Villiers"                                                                                                      
# [2] "I assure my right hon. Friend that I shall come to that in due course. I have great sympathy with his observation."

在R中提取标点符号左侧的文本

2 个答案: