R grep regular expression using elements in a vector (FOLLOW UP)

Question

Following up on this question, I have another example where I cannot use the accepted answer.

Again, I want to find each of the exact group elements in the

Answer 1

+ is a special character in regex. You will need "\+" to escape the special character.

new_group <- gsub("\\+",replacement = "\\\\+",x =groups)

Also, "|" in grep serves like "or".

new_group1 <- paste0(new_group,collapse = "|")

grep(pattern = new_group1,x = labs,value = T)