Get the strings before the comma with R

Question

I am a beginner with R. Now, I have a vector in a data.frame like this

city
Kirkland,
Bethesda,
Wellington,
La Jolla,
Berkeley,
Costa, Evie KW172NJ
Miami,
P         


        

Answer 1

You can use gsub with a bit of regexp :

cities <- gsub("^(.*?),.*", "\\1", df$city)

This one works, too :

cities <- gsub(",.*$", "", df$city)