Remove prefix from all data in a single column in R

问题

I would have a column where the data looks like this:

M999-00001
M999-00002
...

Is there a way to remove all the 'M's in the column in R?

回答1:

We can use sub

df1[,1] <- sub("^.", "", df1[,1])

Or use substring

substring(df1[,1],2)

data

df1 <- data.frame(Col1 = c("M999-00001", "M999-0000"), stringsAsFactors=FALSE)

回答2:

You can use gsub function for the same

Col1 <- gsub("[A-z]","",Col1)
[1] "999-00001" "999-0000" 

data

Col1 = c("M999-00001", "M999-0000")

回答3:

df %>%
transform(col_name=str_replace(col_name,"M",""))

Use it only if you have installed stringr library and magrittr library

来源：https://stackoverflow.com/questions/38909564/remove-prefix-from-all-data-in-a-single-column-in-r