[R] gsub to manipulate characters

[syrvn]

Hello,

from a vector of strings I want to delete everything after the _

> v <- c("AAA_BB", "FF_MM")
> gsub("_*", "", v)
[1] "AAABB" "FFMM" 


but should be
[1] "AAA" "FF" 


Why does * not work? Even perl=TRUE does not give me the right result

Man thanks!


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