替换包含涉及特殊特征的不均匀图案的子字符串
我有一个数据，其中一个变量具有非均匀模式/格式，我需要在r中编写一个代码，该代码可以在变量中删除遵循特定模式的变量的该部分。
有关于替换模式的链接在r 中，替换模式在r 中分开的模式，and 删除字符串的一部分，但他们尚未讨论与我的问题数据。
这就是变量（c）的样子，下面是我尝试的选项以及它们的结果。
c <- c("1998/123; 2001","181;2002/12","212")
c1 <- gsub("[0-9]/[0-9]", "", c) # returns 19923;2001, 181;2002, 212
c2 <- gsub("[0-9]/*", "", c) # returns ";", " ", ";", ""
c3 <- gsub("[0-9][0-9][0-9][0-9]/", "", c) # returns 123;2001, 181;12, 212
c4 <- gsub("*[0-9]/[0-9]*", "", c) # returns 199, 200, 212
c5 <- gsub(" */* ", "", c) # no change
c6 <- str_replace_all(c,"/","") # returns 1998123, 200212, 212
c7 <- grep(fixed("/"), c, invert=TRUE, value = TRUE) # returns 212
a）向前斜线后可以有3-8位数字。但是，在向前斜线之前只能有4位数字。
b）每个子弦被半串分隔符。
c）我想替换那些用空白包含前向斜线的子字符串。因此，我的结果应该是C（“; 2001”，“ 181;”，“ 212”）。
请让我知道我在哪里犯错。任何建议都非常欢迎。谢谢。
I have a data wherein one of the variable has a non-uniform pattern/format and I need to write a code in R which can remove that part of the string in the variable which follows a specific pattern.
There are links on replacement of patterns such as Extract a string between patterns/delimiters in R, Replace patterns separated by delimiter in R, and Remove part of a string but they haven't discussed the issue related to my data.
This is how the variable (c) looks like and below are the options I tried along with their results.
c <- c("1998/123; 2001","181;2002/12","212")
c1 <- gsub("[0-9]/[0-9]", "", c) # returns 19923;2001, 181;2002, 212
c2 <- gsub("[0-9]/*", "", c) # returns ";", " ", ";", ""
c3 <- gsub("[0-9][0-9][0-9][0-9]/", "", c) # returns 123;2001, 181;12, 212
c4 <- gsub("*[0-9]/[0-9]*", "", c) # returns 199, 200, 212
c5 <- gsub(" */* ", "", c) # no change
c6 <- str_replace_all(c,"/","") # returns 1998123, 200212, 212
c7 <- grep(fixed("/"), c, invert=TRUE, value = TRUE) # returns 212
a) There can be 3-8 digits after the forward slash. But there can only be 4 digits before the forward slash.
b) Each sub-string is separated by a semicolon delimiter.
c) I want to replace those substrings that contain the forward slash with blank. So, my result should be c(";2001", "181;" ,"212").
Kindly let me know where am I making the mistake. Any suggestions are very much welcome. Thanks.
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由于前向斜线之前和之后的数字具有多个数字，您可以在第一种方法中使用
+（1或更多）或*（0及以上），以删除所有他们：As the numbers before and after the forward slash have multiple digits you could use
+(1 or more) or*(0 and more) in your first approach to remove all of them: