Currently in R, with data.table, I have the following column:
目前在R中,有data.table,我有以下专栏:
[email protected]
[email protected]
[email protected]
j*****[email protected]
which are factors. I would like to parse the above so that I can get the first and last letters of the username before the @ symbol.
哪些是因素。我想解析上面的内容,以便我可以在@符号之前获取用户名的第一个和最后一个字母。
So for the above I'd like to get:
所以对于上面我想得到:
jn
be
cr
jn
I deal with some asterisked usernames so I added it in too. Is there a simple way to do this? Any thoughts would be greatly appreciated.
我处理了一些带星号的用户名,所以我也添加了它。有一个简单的方法吗?任何想法将不胜感激。
1 个解决方案
#1
4
Match the following pattern to the strings and replace it with the capture groups:
将以下模式与字符串匹配,并将其替换为捕获组:
sub("(.).*(.)@.*", "\\1\\2", s)
## [1] "jn" "be" "cr" "jn"
Note
The input strings in reproducible form is:
可重现形式的输入字符串是:
s <- c("[email protected]", "[email protected]", "[email protected]",
"j*****[email protected]")
#1
4
Match the following pattern to the strings and replace it with the capture groups:
将以下模式与字符串匹配,并将其替换为捕获组:
sub("(.).*(.)@.*", "\\1\\2", s)
## [1] "jn" "be" "cr" "jn"
Note
The input strings in reproducible form is:
可重现形式的输入字符串是:
s <- c("[email protected]", "[email protected]", "[email protected]",
"j*****[email protected]")