[R] remove last char of a text string

From: glaporta <glaporta_at_freeweb.org>
Date: Mon, 14 Jun 2010 06:47:11 -0700 (PDT)

Dear R experts,
is there a simple way to remove the last char of a text string? substr() function use as parameter start end only... but my strings are of different length...
01asap05a -> 01asap05
02ee04b -> 02ee04
Thank you all,

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