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I can remove the last character from a string:
listfruit <- c("aapplea","bbananab","oranggeo")
gsub('.{1}$', '', listfruit)
But I am having problems trying to remove the first character from a string. And also the first and last character. I would be grateful for your help.
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If we need to remove the first character, use sub , match one character ( . represents a single character), replace it with '' . Or for the first and last character, match the character at the start of the string ( ^. ) or the end of the string ( .
To remove first character from column name in R data frame, we can use str_sub function of stringr package.
You can use the substr function like this: echo substr($myStr, 0, 5); The second argument to substr is from what position what you want to start and third arguments is for how many characters you want to return.
The substring function in R can be used either to extract parts of character strings, or to change the values of parts of character strings. substring of a vector or column in R can be extracted using substr() function. To extract the substring of the column in R we use functions like substr() and substring().
If we need to remove the first character, use sub, match one character (. represents a single character), replace it with ''.
sub('.', '', listfruit)
#[1] "applea" "bananab" "ranggeo"
Or for the first and last character, match the character at the start of the string (^.) or the end of the string (.$) and replace it with ''.
gsub('^.|.$', '', listfruit)
#[1] "apple" "banana" "rangge"
We can also capture it as a group and replace with the backreference.
sub('^.(.*).$', '\\1', listfruit)
#[1] "apple" "banana" "rangge"
Another option is with substr
substr(listfruit, 2, nchar(listfruit)-1)
#[1] "apple" "banana" "rangge"
library(stringr)
str_sub(listfruit, 2, -2)
#[1] "apple" "banana" "rangge"
Removing first and last characters.
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