[R] substring from behind

[Mat]

Hello together,

i have a question for "substring".
I know i can filter a number like this one:
bill$No<-substring(bill$Customer,2,4)

in this case i get the 2nd, 3rd and 4th number of my Customer ID.
But how can i do this, if i want the 2nd, 3rd and 4th number of a column.

Like this one.
I have: Mercedes_02352
Audi_03555
and now i want to filter this data.frame to
235
355

can you help me?

Thanks.

Mat



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