How to remove specific special characters in R

Question

I have some sentences like this one.

c = \"In Acid-base reaction (page[4]), why does it create water and not H+?\" 

I want to remove all sp

Answer 1

In order to get your method to work, you need to put the literal "]" immediately after the leading "["

 gsub("[][!#$%()*,.:;<=>@^_`|~.{}]", "", c)
[1] "In Acid-base reaction page4 why does it create water and not H+?"

You can them put the inner "[" anywhere. If you needed to exclude minus, it would then need to be last. See the ?regex page after all of those special pre-defined character classes are listed.