Problem with a regular expression.
I tried this on a Linux (Ubuntu) server invoking R from the command line and the result was the same, except that I could kill the R session from another terminal window.
From: Rui Barradas <ruipbarradas at sapo.pt>
To: Chris Triggs <cm.triggs at auckland.ac.nz>; "r-devel at r-project.org" <r-devel at r-project.org>
Cc: Thomas Lumley <t.lumley at auckland.ac.nz>
Sent: Thursday, 17 August 2017, 17:26
Subject: Re: [Rd] Problem with a regular expression.
Hello,
This seems to be serious.
RGui.exe, fresh session. I've clicked File > New Script and wrote
Oldterm <- c("A", "B", "A", "*", "B")
strsplit(Oldterm, "\\\\)" )
Ran each instruction at a time with Ctrl+r and with the strsplit call
the system froze.
Ctrl+Alt+Del didn't work, I had to go for the power switch button.
sessionInfo()
R version 3.4.1 (2017-06-30)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1
Matrix products: default
locale:
[1] LC_COLLATE=Portuguese_Portugal.1252
LC_CTYPE=Portuguese_Portugal.1252
[3] LC_MONETARY=Portuguese_Portugal.1252 LC_NUMERIC=C
[5] LC_TIME=Portuguese_Portugal.1252
attached base packages:
[1] stats? ? graphics? grDevices utils? ? datasets? methods? base
loaded via a namespace (and not attached):
[1] compiler_3.4.1
Rui Barradas
Em 16-08-2017 23:31, Chris Triggs escreveu:
Hi... I have come upon a problem with a regular expression which causes base-R to freeze.? I have reproduced the phenomenon on several machines running R under Windows 10, and also under OSX? on different Apple MACs. The minimal example is:- Oldterm is a vector of characters, e.g. "A", "B", "A", "*", "B" The regular expression is "\\\\)" The call which freezes R is strsplit(Oldterm, "\\\\)" ) Thomas - after he had reproduced the problem - suggested that I submit it to r-devel. Best wishes.... ? ? ? ? ? ? Chris Triggs ??? [[alternative HTML version deleted]]
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