t = as.character("ETS2 (log2)")
t2 = as.character("ETS1 (log2)")

#for t1
    gsub("[ (log2)]", "", t)
    str_replace_all(t, "[[ (log2)]]", "")
    #for t2
    gsub("[ (log2)]", "", t2)
    str_replace_all(t2, "[[ (log2)]]", "")

#for t1
    "ETS "
    "ETS "
    #for t2
    "ETS1 "
    "ETS1 "

#for t1
    "ETS2 "
    "ETS2 "
    #for t2
    "ETS1 "
    "ETS1 "