[R] exact pattern match in grep for column headers

[1Rnwb]

the current code is like this
vidx<-grep(paste('^',vars[vi],'$',sep=''),gsub("[[:punct:]]","",strrl1[[datbeg-1]]),ignore.case=T)

where as the old one was
vidx<-grep(vars[vi],gsub("[[:punct:]]","",strrl1[[datbeg-1]]),ignore.case=T)

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