Filter a column which contains several keywords

Question

I am trying to filter a column which contains several keywords (in this example dog and cat) but I am having problems as only the first element is being used.

Answer 1

Like @Tgsmith61591 mentioned, the pattern argument for the grep function requires a string. Since you're passing in a vector it's warning you that it will only process the first element.

Another solution would be something like this:

dfilter <- unique(grep(paste(filter1, collapse = "|"), df1$type, value=TRUE))

See this post grep using a character vector with multiple patterns