The output from strsplit("hello","") is not suitable as input for the second argument for charmatch. compare with: charmatch("o",strsplit("hello","")[[1]]) -- View this message in context: http://n4.nabble.com/Matching-a-character-in-a-string-tp1289795p1289976.html Sent from the R help mailing list archive at Nabble.com.