R gsub a single double quotation mark

Question

I have a field of strings in a data frame all similar to:

\"Young Adult – 8-9\"\" 

where the inner single \" is what I want to repl

Answer 1

You do not need to escape a double quote in a regular expression. Just use "\"" or '"' to match a single double quote.

s = "Young Adult – 8-9\""
s
[1] "Young Adult – 8-9\""
gsub("\"", "", s)
[1] "Young Adult – 8-9"
gsub('"', "", s)
[1] "Young Adult – 8-9"

See this IDEONE demo

NOTE: Since you want to remove some literal text, you do not even need a regex, use fixed=TRUE argument to speed up the operation:

gsub('"', "", s, fixed=TRUE)