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  1. x <- c(" Agarista revoluta (Spreng.) Hook. f. ex Nied.", " Amaioua intermedia Mart.", " Baccharis reticularia DC.")
  2. sub("^\\s*(\\S+\\s+\\S+).*", "\\1", x)
Success #stdin #stdout 0.23s 60752KB
stdin
Standard input is empty
stdout
[1] "Agarista revoluta"     "Amaioua intermedia"    "Baccharis reticularia"