[ID 20001029.005] Regex error: "cd. (A. Tw)" !~ /\((\w\. \w+)\)/

This is a bug report for perl from jtobey@john-edwin-tobey.org,
generated with the help of perlbug 1.28 running under perl v5.6.0.


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

Here is a regex whose behavior changed from 5.005 to 5.6.0, and I
agree with the old behavior.

$ perl5.00503 -le 'die unless "cd. (A. Tw)" =~ /\((\w\. \w+)\)/; print "ok"'
ok
$ perl5.6.0 -le 'die unless "cd. (A. Tw)" =~ /\((\w\. \w+)\)/; print "ok"'
Died at -e line 1.

It still fails as of perl@7452, giving this -Dr output:

    Compiling REx `\((\w\. \w+)\)'
    size 14 first at 1
    rarest char ) at 0
    rarest char . at 0
    synthetic stclass `ANYOF[(]'.
       1: EXACT <(>(3)
       3: OPEN1(5)
       5:   ALNUM(6)
       6:   EXACT <. >(8)
       8:   PLUS(10)
       9:     ALNUM(0)
      10: CLOSE1(12)
      12: EXACT <)>(14)
      14: END(0)
    anchored `. ' at 2 floating `)' at 5..2147483647 (checking anchored) stclass `AN
    YOF[(]' minlen 6 
    Omitting $` $& $' support.

    EXECUTING...

    Guessing start of match, REx `\((\w\. \w+)\)' against `cd. (A. Tw)'...
    Found anchored substr `. ' at offset 2...
    Found floating substr `)' at offset 10...
    This position contradicts STCLASS...
    Looking for anchored substr starting at offset 3...
    Found anchored substr `. ' at offset 6...
    Contradicts floating substr `)', giving up...
    Match rejected by optimizer
    Died at -e line 1.
    Freeing REx: `\((\w\. \w+)\)'

Whereas under 5.00503, -Dr shows:

    compiling RE `\((\w\. \w+)\)'
    size 14 first at 1
    rarest char ) at 0
    rarest char . at 0
       1: EXACT <(>(3)
       3: OPEN1(5)
       5:   ALNUM(6)
       6:   EXACT <. >(8)
       8:   PLUS(10)
       9:     ALNUM(0)
      10: CLOSE1(12)
      12: EXACT <)>(14)
      14: END(0)
    anchored `. ' at 2 floating `)' at 5..2147483647 (checking anchored) minlen 6 
    Omitting $` $& $' support.

    EXECUTING...

    Matching `\((\w\. \w+)\)' against `cd. (A. Tw)'
      Setting an EVAL scope, savestack=3
       0 <> <cd. (A. Tw)>     |  1:  EXACT <(>
      Setting an EVAL scope, savestack=3
       4 <cd. > <(A. Tw)>     |  1:  EXACT <(>
       5 <cd. (> <A. Tw)>     |  3:  OPEN1
       5 <cd. (> <A. Tw)>     |  5:  ALNUM
       6 <cd. (A> <. Tw)>     |  6:  EXACT <. >
       8 <cd. (A. > <Tw)>     |  8:  PLUS
                               ALNUM can match 2 times out of 32767...
      Setting an EVAL scope, savestack=3
      10 <cd. (A. Tw> <)>     | 10:    CLOSE1
      10 <cd. (A. Tw> <)>     | 12:    EXACT <)>
      11 <cd. (A. Tw)> <>     | 14:    END
    ok

Please someone else look at the regex engine... :-)

-John

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=high
---
Site configuration information for perl v5.6.0:

Configured by jtobey at Thu Mar 23 22:15:45 EST 2000.

Summary of my perl5 (revision 5.0 version 6 subversion 0) configuration:
  Platform:
    osname=linux, osvers=2.2.14pre16, archname=i686-linux
    uname='linux feynman 2.2.14pre16 #1 thu dec 23 19:33:36 est 1999 i686 unknown '
    config_args='-Doptimize=-g -O2 -fPIC -Dprefix=/usr/local -Dcc=gcc -des'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
    useperlio=undef d_sfio=undef uselargefiles=define 
    use64bitint=undef use64bitall=undef uselongdouble=undef usesocks=undef
  Compiler:
    cc='gcc', optimize='-g -O2 -fPIC', gccversion=2.95.2 20000220 (Debian GNU/Linux)
    cppflags='-DDEBUGGING -fno-strict-aliasing -I/usr/local/include'
    ccflags ='-DDEBUGGING -fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64'
    stdchar='char', d_stdstdio=define, usevfork=false
    intsize=4, longsize=4, ptrsize=4, doublesize=8
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=4, usemymalloc=n, prototype=define
  Linker and Libraries:
    ld='gcc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lnsl -lndbm -lgdbm -ldbm -ldb -ldl -lm -lc -lposix -lcrypt
    libc=/lib/libc-2.1.3.so, 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:
    

---
@INC for perl v5.6.0:
    /usr/local/lib/perl5/5.6.0/i686-linux
    /usr/local/lib/perl5/5.6.0
    /usr/local/lib/perl5/site_perl/5.6.0/i686-linux
    /usr/local/lib/perl5/site_perl/5.6.0
    /usr/local/lib/perl5/site_perl/5.5.670/i686-linux
    /usr/local/lib/perl5/site_perl/5.5.670
    /usr/local/lib/perl5/site_perl/5.5.660/i686-linux
    /usr/local/lib/perl5/site_perl/5.5.660
    /usr/local/lib/perl5/site_perl/5.5.650/i686-linux
    /usr/local/lib/perl5/site_perl/5.5.650
    /usr/local/lib/perl5/site_perl/5.005/i686-linux
    /usr/local/lib/perl5/site_perl/5.005
    /usr/local/lib/perl5/site_perl
    .

---
Environment for perl v5.6.0:
    HOME=/home/jtobey
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/jtobey/bin:/jtobey/local/bin:/usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin:/usr/local/sbin:/usr/sbin:/sbin
    PERL_BADLANG (unset)
    SHELL=/bin/bash

• [ID 20001029.005] Regex error: "cd. (A. Tw)" !~ /\((\w\. \w+)\)/ by jtobey
• Re: [ID 20001029.005] Regex error: "cd. (A. Tw)" !~ /\((\w\. \w+)\)/ by Hugo
• Re: [ID 20001029.005] Regex error: "cd. (A. Tw)" !~ /\((\w\. \w+)\)/ by Hugo
• Re: [ID 20001029.005] Regex error: "cd. (A. Tw)" !~ /\((\w\. \w+)\)/ by Hugo
• Re: [ID 20001029.005] Regex error: "cd. (A. Tw)" !~ /\((\w\. \w+)\)/ by John Tobey
• Re: [ID 20001029.005] Regex error: "cd. (A. Tw)" !~ /\((\w\. \w+)\)/ by John Tobey