[R] regular expression for nth character in a string

From: Gonšalo Ferraz <gferraz29_at_gmail.com>
Date: Mon, 25 Apr 2011 06:17:44 -0400

Hi, I have a string


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.


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