I am struggling to remove the substring before the underscore in my string. I want to use * (wildcard) as the bit before the underscore can vary:
a <- c("foo_5", "bar_7")
a <- gsub("*_", "", a, perl = TRUE)
The result should look like:
> a
[1] 5 7
I also tried stuff like "^*" or "?" but did not really work.
The following code works on your example :
gsub(".*_", "", a)
Alternatively, you can also try:
gsub("\\S+_", "", a)
Praveen
as.numeric(gsub(pattern=".*_", replacement = '', a)
[1] 5 7
来源：https://stackoverflow.com/questions/11776287/remove-pattern-from-string-with-gsub