will this do it:
> x <- "InTrouble"
> sub("^(..).*", "\\1", x) # first two
[1] "In"
> sub(".*(...)$", "\\1", x) # last three
[1] "ble"
> sub("^..(...).*", "\\1", x) # 3rd,4th,5th char
[1] "Tro"
>
2011/4/25 Gonçalo Ferraz <gferra...@gmail.com>:
> Hi, I have a string
>
> "InTrouble"
>
> and want to extract, say, the first two characters: "In"
> or the last three: "blee"
> or the 3rd, 4th, and 5th: "Trou"
>
> Is there an easy way of doing this quickly with regular expressions in gsub,
> grep or similar?
>
> Thank you for any help.
>
> Gonçalo
>
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>
--
Jim Holtman
Data Munger Guru
What is the problem that you are trying to solve?
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