How to remove + using regex in R

Question

How can one use regex to remove + signs in strings.

I am sure there is a simple solution but I couldn't find it. Here is a toy example.

X            Y

mouse+       8 
elephant+    9
wolf         5

Attempted many variations of gsub but with no success.

DF$X <- gsub(DF$X, pattern = "\+", replacement = "")

Output should look like this

X            Y

mouse        8 
elephant     9
wolf         5

`DF$X <- gsub(DF$X, pattern = "+", replacement = "",fixed=T)` — Duck, Aug 12 '20 at 15:41
The `"+"` symbol has special meaning in regular expression, so if you need the exact "+" symbol, you have to use an escape character, i.e. `"\\+"`(double backslash) or set `fixed = T`. — Darren Tsai, Aug 12 '20 at 16:18

score 0 · Answer 1 · answered Aug 12 '20 at 15:50

0

Another way you can do

library(stringr)
df <- df %>% 
  mutate(X = str_replace_all(X, "(\\+)", ""))
#         X  Y
# 1    mouse 8
# 2 elephant 9
# 3     wolf 5

answered Aug 12 '20 at 15:50

Tho Vu

1

For supplement, `str_replace_all(string, pattern, "")` is equivalent to `str_remove_all(string, pattern)` – Darren Tsai Aug 12 '20 at 16:44
@DarrenTsai It is a good point. Thanks for your helpful information. – Tho Vu Aug 12 '20 at 16:54

1 Answers1