R：gsub，匹配并删除

Question

I have an dataframe x where

x[1]= "red monkey"
X[2]= "blue whale"
X[3]= "Pink Panther"

and so on...(as it is a big data set)

color=read.csv("colors.csv")
color[,3]
Blue
Red
White
Grey
Pink
Red
Green

I have to match if X[i] contains any word from color[,3] and if yes, then remove it. ie the result should be another data frame like this

y[1]= "monkey"
y[2]= "whale"
y[3]= "Panther"

and so on..

How can I do that.

Thanks in advance.

Answer 1

Assuming x is a vector,

gsub(paste(tolower(color[,3]), collapse='|'), '', tolower(x))
#[1] " monkey"  " whale"   " panther"

#to trim the whitespaces,
trimws(gsub(paste(tolower(color[,3]), collapse='|'), '', tolower(x)))
#[1] "monkey"  "whale"   "panther"