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[ID 20010809.023] perlre misleads when stating that (?i) shouldbe at front of pattern

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From:
David Dyck
Date:
August 9, 2001 11:22
Subject:
[ID 20010809.023] perlre misleads when stating that (?i) shouldbe at front of pattern
Message ID:
200108091822.LAA16920@dd.tc.fluke.com
This is a bug report for perl from dcd@tc.fluke.com,
generated with the help of perlbug 1.33 running under perl v5.7.2.


-----------------------------------------------------------------
[Please enter your report here]

The discussion of (?i) in perlre section on 
 Extended Patterns / "(?imsx-imsx)"
states:
 .. The case insensitive ones need to
     include merely "(?i)" at the front of the pattern.

My experiments seem to indicate that a non-nested (?i) 
anywhere in the re triggers the case insensitivity.

E.g.  /A(?:B)(?i)/
  matches all of the following qw(ab aB Ab AB)
Of course /A(?i:B)/ matches only Ab and Ab

print "@{[ grep {/A(?:B)(?i)/} (qw(ab aB Ab AB)) ]}\n"
ab aB Ab AB

print "@{[ grep {/A(?i:B)/} (qw(ab aB Ab AB)) ]}\n"
Ab AB

Should this behavior be documented to occur even
when (?i) is not at the front of the re?

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=docs
    severity=low
---
Site configuration information for perl v5.7.2:

Configured by dcd at Mon Aug  6 21:03:32 PDT 2001.

Summary of my perl5 (revision 5.0 version 7 subversion 2 patch 11598) configuration:
  Platform:
    osname=linux, osvers=2.4.7-ac7, archname=i686-linux
    uname='linux dd 2.4.7-ac7 #4 mon aug 6 09:05:49 pdt 2001 i686 '
    config_args='-Dinstallusrbinperl -Uversiononly -Dusedevel -Doptimize=-O3 -g -de -Dcf_email=dcd@tc.fluke.com'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
    useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
    usemymalloc=n, bincompat5005=define
  Compiler:
    cc='cc', ccflags ='-DDEBUGGING -fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O3 -g',
    cppflags='-DDEBUGGING -fno-strict-aliasing -I/usr/local/include'
    ccversion='', gccversion='egcs-2.91.66.1 19990314/Linux (egcs-1.1.2 release)', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=4
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lgdbm -ldbm -ldb -ldl -lm -lc
    perllibs=-ldl -lm -lc
    libc=/lib/libc.so.5.4.44, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
    cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:
    DEVEL11596

---
@INC for perl v5.7.2:
    /usr/local/lib/perl5/5.7.2/i686-linux
    /usr/local/lib/perl5/5.7.2
    /usr/local/lib/perl5/site_perl/5.7.2/i686-linux
    /usr/local/lib/perl5/site_perl/5.7.2
    /usr/local/lib/perl5/site_perl/5.6.1/i686-linux
    /usr/local/lib/perl5/site_perl/5.6.1
    /usr/local/lib/perl5/site_perl
    .

---
Environment for perl v5.7.2:
    HOME=/home/dcd
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/dcd/bin:/sbin:/usr/local/bin:/bin:/usr/bin:/usr/X11/bin:/usr/games:/usr/local/samba:/home/hobbes/tools/scripts:/home/hobbes/tools/linux:/usr0/hobbes/tools/scripts:/usr0/dcd/bin:/apps/general/bin:/usr/public
    PERL_BADLANG (unset)
    SHELL=/bin/bash


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