[R] splitting sample names

[1Rnwb]

I have a data frame like this
xx<-data.frame(cbind(Sample=c('Ctrl_6h','1+0_6h','1+200_6h','1+5k_6h','Ctrl_5K_6h','ConA_6h'),
                 IFIT1=c(24,25,24.7,24.5,24.2,24.8)))

grep('[[:digit:]]h',xx$Sample)

yy<-xx$Sample

strsplit(yy,"_")

I have to extract the time information separated by '_' in the sample names,
i tried grep and strsplit, it looks that i am not providing some information
correctly. I would appreciate if someone can point me to the correct way.
Thanks
Sharad

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