From @khwilliamson

This is a bug report for perl from khw@​khw.(none),
generated with the help of perlbug 1.40 running under perl 5.23.3.

blead -le 'qr/(?[ [B] | ! ( [^B] ) ])/'

doesn't compile, instead giving the incorrect error​:

Unexpected '(' with no preceding operator in regex; marked by <-- HERE
in m/(?[ [B] | ! ( <-- HERE [^B] ) ])/ at -e line 1.

Flags​:
  category=core
  severity=medium

Site configuration information for perl 5.23.3​:

Configured by khw at Mon Aug 24 20​:37​:52 MDT 2015.

Summary of my perl5 (revision 5 version 23 subversion 3) configuration​:
  Commit id​: 6a475a4
  Platform​:
  osname=linux, osvers=3.19.0-26-generic,
archname=x86_64-linux-thread-multi-ld
  uname='linux khw 3.19.0-26-generic #28-ubuntu smp tue aug 11
14​:16​:32 utc 2015 x86_64 x86_64 x86_64 gnulinux '
  config_args='-des -Uversiononly -Dprefix=/home/khw/blead -Dusedevel
-D'optimize=-ggdb3' -A'optimize=-ggdb3' -A'optimize=-O0'
-Accflags='-DPERL_BOOL_AS_CHAR' -Dman1dir=none -Dman3dir=none
-DDEBUGGING -Dcc=g++ -Dusemorebits -Dusethreads'
  hint=recommended, useposix=true, d_sigaction=define
  useithreads=define, usemultiplicity=define
  use64bitint=define, use64bitall=define, uselongdouble=define
  usemymalloc=n, bincompat5005=undef
  Compiler​:
  cc='g++', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DPERL_BOOL_AS_CHAR
-fwrapv -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector-strong
-I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64
-D_FORTIFY_SOURCE=2',
  optimize=' -ggdb3 -O0',
  cppflags='-D_REENTRANT -D_GNU_SOURCE -DPERL_BOOL_AS_CHAR -fwrapv
-DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector-strong
-I/usr/local/include'
  ccversion='', gccversion='4.9.2', gccosandvers=''
  intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678,
doublekind=3
  d_longlong=define, longlongsize=8, d_longdbl=define,
longdblsize=16, longdblkind=3
  ivtype='long', ivsize=8, nvtype='long double', nvsize=16,
Off_t='off_t', lseeksize=8
  alignbytes=16, prototype=define
  Linker and Libraries​:
  ld='g++', ldflags =' -fstack-protector-strong -L/usr/local/lib'
  libpth=/usr/include/c++/4.9 /usr/include/x86_64-linux-gnu/c++/4.9
/usr/include/c++/4.9/backward /usr/local/lib
/usr/lib/gcc/x86_64-linux-gnu/4.9/include-fixed
/usr/include/x86_64-linux-gnu /usr/lib /lib/x86_64-linux-gnu /lib/../lib
/usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib
  libs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
  perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
  libc=libc-2.21.so, so=so, useshrplib=false, libperl=libperl.a
  gnulibc_version='2.21'
  Dynamic Linking​:
  dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
  cccdlflags='-fPIC', lddlflags='-shared -ggdb3 -ggdb3 -O0
-L/usr/local/lib -fstack-protector-strong'

@​INC for perl 5.23.3​:
  /home/khw/perl/blead/lib
  /home/khw/blead/lib/perl5/site_perl/5.23.3/x86_64-linux-thread-multi-ld
  /home/khw/blead/lib/perl5/site_perl/5.23.3
  /home/khw/blead/lib/perl5/5.23.3/x86_64-linux-thread-multi-ld
  /home/khw/blead/lib/perl5/5.23.3
  /home/khw/blead/lib/perl5/site_perl/5.23.2
  /home/khw/blead/lib/perl5/site_perl/5.23.1
  /home/khw/blead/lib/perl5/site_perl/5.23.0
  /home/khw/blead/lib/perl5/site_perl/5.22.0
  /home/khw/blead/lib/perl5/site_perl/5.21.12
  /home/khw/blead/lib/perl5/site_perl/5.21.11
  /home/khw/blead/lib/perl5/site_perl/5.21.10
  /home/khw/blead/lib/perl5/site_perl/5.21.9
  /home/khw/blead/lib/perl5/site_perl/5.21.8
  /home/khw/blead/lib/perl5/site_perl/5.21.7
  /home/khw/blead/lib/perl5/site_perl/5.21.6
  /home/khw/blead/lib/perl5/site_perl/5.21.5
  /home/khw/blead/lib/perl5/site_perl/5.21.4
  /home/khw/blead/lib/perl5/site_perl/5.21.3
  /home/khw/blead/lib/perl5/site_perl/5.21.2
  /home/khw/blead/lib/perl5/site_perl/5.21.1
  /home/khw/blead/lib/perl5/site_perl/5.20.0
  /home/khw/blead/lib/perl5/site_perl/5.19.12
  /home/khw/blead/lib/perl5/site_perl/5.19.11
  /home/khw/blead/lib/perl5/site_perl/5.19.10
  /home/khw/blead/lib/perl5/site_perl
  .

Environment for perl 5.23.3​:
  HOME=/home/khw
  LANG=en_US.UTF-8
  LANGUAGE=en_US
  LD_LIBRARY_PATH (unset)
  LOGDIR (unset)

PATH=/home/khw/bin​:/home/khw/perl5/perlbrew/bin​:/home/khw/print/bin​:/bin​:/usr/local/sbin​:/usr/local/bin​:/usr/sbin​:/usr/bin​:/sbin​:/usr/games​:/usr/local/games​:/home/khw/iands/www​:/home/khw/cxoffice/bin
  PERL5OPT=-w
  PERL_BADLANG (unset)
  PERL_POD_PEDANTIC=1
  SHELL=/bin/ksh

@khwilliamson - Status changed from 'new' to 'open'

From @khwilliamson

This was fixed by ab87267 except in solaris 64bitall builds, which has a separate ticket #127455
--
Karl Williamson

@khwilliamson - Status changed from 'open' to 'pending release'

From @khwilliamson

Thank you for submitting this report. You have helped make Perl better.
 
With the release of Perl 5.24.0 on May 9, 2016, this and 149 other issues have been resolved.

Perl 5.24.0 may be downloaded via https://metacpan.org/release/RJBS/perl-5.24.0

@khwilliamson - Status changed from 'pending release' to 'resolved'