[Rd] sub() crashes (PR#7154)

[ggrothendieck at myway.com]

Full_Name: G. Grothendieck
Version: R 1.9.1 patched 2004-07-13
OS: Windows XP
Submission from: (NULL) (209.226.152.23)



The following command causes R to crash every time:

sub("(.) (.)", "\\1 \\2 \\3", "abc", perl = TRUE)

on Windows XP R version 1.9.1 patched version of 2004-07-13.