[R] Searching for the first two characters of a string

Remko Duursma remkoduursma at gmail.com
Mon Nov 21 01:13:40 CET 2011

dfr <- data.frame(txt= c("abab","ghghg","ththt","dfdfdf"), yvar=1:4)

ind <- substr(dfr$txt,1,2)

dfr[ind == "ab",]


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