From dietmar.schindler at manroland-web.com  Tue Apr  4 10:45:30 2017
From: dietmar.schindler at manroland-web.com (dietmar.schindler at manroland-web.com)
Date: Tue, 4 Apr 2017 08:45:30 +0000
Subject: [Rd] Bug report: POSIX regular expression doesn't match for
 somewhat higher values of upper bound
Message-ID: <2c87513c247b4e13b22f278e15a034d1@AUSMXMBX03.mrws.biz>

Dear Sirs,

while

> regexpr('(.{1,2})\\1', 'foo')
[1] 2
attr(,"match.length")
[1] 2
attr(,"useBytes")
[1] TRUE

yields the correct match, an incremented upper bound in

> regexpr('(.{1,3})\\1', 'foo')
[1] -1
attr(,"match.length")
[1] -1
attr(,"useBytes")
[1] TRUE

incorrectly yields no match.

R versions tested:
2.11.1 on i486-pc-linux-gnu
2.15.1 on x86_64-pc-linux-gnu
3.2.1 on i386-w64-mingw32
3.2.1 on x86_64-w64-mingw32
3.3.3 on x86_64-w64-mingw32
--
Best regards,
Dietmar Schindler
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[Rd] Bug report: POSIX regular expression doesn't match for somewhat higher values of upper bound
dietmar.schindler at manroland-web.com