I am using 10.0 ArcView and am trying to get the "R" in R12345678910 to drop.
The numbers are in a column in the attribute table and i've always used VB scripting.
I was using Field Calculator.
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Right( [FieldName], 11 )
This code will take the 11 characters from the right, and anything left of those 11 characters is omitted.
This code takes a string and removes R from the left/front of it.
Both of these examples should get rid of the R in your strings.
Edit: Regan Sarwas' updated answer works great and is actually more versatile because it can handle more cases.