Yet another match error

• Date: Thu, 17 Aug 1995 08:55:02 PDT
• From:
  azuki@ci.uminho.pt
• Content-Length: 1514
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I don't know if this error was already posted here as I do not read MOO Cows.
If it was, I apologise but nevertheless state that this error is quite serious,
especially to someone like myself who use regular expressions a lot.

;substitute("%1+%2+%3+%4",match("me as A guy in the mood for maths","^%(.+%) +%(in +%([^ ]+%) +%)?as +%(.*%)$"))
=> "me+as A guy in the +t+A guy in the mood for maths"

Now, I thought this was fishy, look at the same in Perl:

$_="me as A guy in the mood for maths";
print "$1+$2+$3+$4" if /^(.+) +(in +([^ ]+) +)?as +(.*)$/;

Result: me+++A guy in the mood for maths

A little strange how %(in +%([^ ]+%) +%)? matched 'as A guy in the ' and the
inner parenthesis matched 't'...

-- 
                                 |\_/|
                                 |@ @|
 ,-------------------------vvvV--<o o>--Vvvv---------------------------------.
 |           Rui Mendes           V"V                                        |
 |      azuki@s700.uminho.pt            Any sufficiently advanced technology |
 |  http://s700.uminho.pt/~azuki          is indistinguishable from magic.   |
 |      Finger me for PGP key                     Arthur C. Clarke           |
 `---------------------------------------------------------------------------'

$x=<<EOF;$x=~s/./$x{$&}++;$&/ge;%x=map{$_,$c++}sort{$x{$b}<=>$x{$a}}keys%x;$x=~s/./for(1..$x{$&}){vec($v,$n++,1)=1;}$n++;/ge;print$v;
12212224314112411111212111314353112411123221312141111121111142213121411331111121111232111331133232213121411321
EOF

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