要从字符串中删除换行符和数字，可以使用以下正则表达式：

gsub("\\n[\\n]?[0-9]?", '', string)

这将删除任何\n后面跟有一个可选\n字符和一个数字的\n字符。请注意，正则表达式中的反斜杠需要在字符串中转义，因此我们在正则表达式中为每个反斜杠使用两个反斜杠。
下面是在R中使用这个正则表达式的一个例子：

#string
string <- "There is a square in the apartment. \n\n4Great laughs, which I hear from the other room. 4 laughs. Several. 9 times ten.\n2"
#code attempt
gsub("\\n[\\n]?[0-9]?", '', string)

这将输出以下字符串：

"There is a square in the apartment. Great laughs, which I hear from the other room. 4 laughs. Several. 9 times ten."

将模式写为[\r\\n0-9]匹配回车符、字符\或n之一或数字0-9
您可以编写匹配一个或多个回车或换行符的模式，后跟可选数字：

[\r\n]+[0-9]*

示例：

string <- "There is a square in the apartment. \n\n4Great laughs, which I hear from the other room. 4 laughs. Several. 9 times ten.\n2"
gsub("[\r\n]+[0-9]*", '', string)

输出量

[1] "There is a square in the apartment. Great laughs, which I hear from the other room. 4 laughs. Several. 9 times ten."

观看R演示。