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[perl #126185] /(?-p)/ should be an error

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Victor ADAM
September 25, 2015 17:03
[perl #126185] /(?-p)/ should be an error
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# New Ticket Created by  Victor ADAM 
# Please include the string:  [perl #126185]
# in the subject line of all future correspondence about this issue. 
# <URL: >

This is a bug report for perl from,
generated with the help of perlbug 1.40 running under perl 5.23.4.

[Please describe your issue here]

How to reproduce

> perl5.23.4 -e '/(?-p)/p; print defined for ${^MATCH}, ${^PREMATCH}, ${^POSTMATCH}'

Expected behavior

Perl should die with the following diagnostic:

> Regexp modifier "p" may not appear after the "-" in regex; marked by <-- HERE in m/(?-p <-- HERE )/ at -e line 1.

Actual behavior

Perl terminates normally and prints:

> 111

The ${^MATCH} variables get defined, which proves that /p is still in effect.
This shows that (?-p) is completely ignored. This also goes against the
documentation, which says that only i, m, s and x can go on the right side of
the minus sign.

[Please do not change anything below this line]
Site configuration information for perl 5.23.4:

Configured by grimy at Tue Sep 22 21:18:14 CEST 2015.

Summary of my perl5 (revision 5 version 23 subversion 4) configuration:
  Commit id: 2d9b5f101563ac9fee41e6ca496f79db6222d2e3
    osname=linux, osvers=4.0.7-2-arch, archname=x86_64-linux
    uname='linux localhost 4.0.7-2-arch #1 smp preempt tue jun 30
07:50:21 utc 2015 x86_64 gnulinux '
    config_args='-ds -e -Dusedevel'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=undef, usemultiplicity=undef
    use64bitint=define, use64bitall=define, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
    cc='cc', ccflags ='-fwrapv -fno-strict-aliasing -pipe
-fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE
    cppflags='-fwrapv -fno-strict-aliasing -pipe
-fstack-protector-strong -I/usr/local/include'
    ccversion='', gccversion='5.1.0', 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='double', nvsize=8, Off_t='off_t',
    alignbytes=8, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -fstack-protector-strong -L/usr/local/lib'
/usr/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/include-fixed /usr/lib
/lib/../lib /usr/lib/../lib /lib /lib64 /usr/lib64
    libs=-lpthread -lnsl -lnm -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc
    perllibs=-lpthread -lnsl -lnm -ldl -lm -lcrypt -lutil -lc, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -O2 -L/usr/local/lib

@INC for perl 5.23.4:

Environment for perl 5.23.4:
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PERL_BADLANG (unset)
    SHELL (unset)

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