From dwinsemius at comcast.net  Wed Sep 22 05:43:58 2010
From: dwinsemius at comcast.net (David Winsemius)
Date: Tue, 21 Sep 2010 23:43:58 -0400
Subject: [Rd] Crash report: regexpr("a{2-}", "")
In-Reply-To: <AANLkTinxcpVMmZ6w6vRL74Xa8fSFUcVFV2t6t3sKszAG@mail.gmail.com>
References: <AANLkTinxcpVMmZ6w6vRL74Xa8fSFUcVFV2t6t3sKszAG@mail.gmail.com>
Message-ID: <B5067C6B-B806-4632-A58B-9F293CD52D3F@comcast.net>


On Sep 21, 2010, at 11:04 PM, Henrik Bengtsson wrote:

> Each of the following calls crash ("core dumps") R (R --vanilla) on
> various versions and OSes:
>
> regexpr("a{2-}", "")
> sub("a{2-}", "")
> gsub("a{2-}", "")
>
>
> EXAMPLES:
>
>> sessionInfo()
> R version 2.11.1 Patched (2010-09-16 r52949)
> Platform: i386-pc-mingw32 (32-bit)
> ...
>> regexpr("a{2-}", "")
> Assertion failed: iter->max == -1 || iter->max == 1, file
> tre-compile.c, line 1825
> This application has requested the Runtime to terminate it in an  
> unusual way.
> Please contact the application's support team for more information.
>
>> sessionInfo()
> R version 2.12.0 Under development (unstable) (2010-09-14 r52910)
> Platform: i386-pc-mingw32/i386 (32-bit)
> ...
>> regexpr("a{2-}", "")
> Assertion failed: iter->max == -1 || iter->max == 1, file
> tre-compile.c, line 1825
> This application has requested the Runtime to terminate it in an  
> unusual way.
> Please contact the application's support team for more information.
>
>
>> sessionInfo()
> R version 2.11.0 Patched (2010-05-09 r51960)
> x86_64-unknown-linux-gnu
> ...
>> regexpr("a{2-}", "")
> R: tre-compile.c:1825: tre_ast_to_tnfa: Assertion `iter->max == -1 ||
> iter->max == 1' failed.
> Aborted

Not a problem in reasonably current Mac with 64bit GUI:
 > regexpr("a{2-}", "")
[1] 1
attr(,"match.length")
[1] 0
 > sub("a{2-}", "")
Error in is.character(x) : 'x' is missing
 > gsub("a{2-}", "")
Error in is.character(x) : 'x' is missing

R version 2.11.1 Patched (2010-08-26 r52822)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
[R.app GUI 1.35 (5612) x86_64-apple-darwin9.8.0]

-- 
David.
>
>
> /Henrik
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel



[Rd] Crash report: regexpr("a{2-}", "")
David Winsemius