in reply to Bizarreness in ?PATTERN? and g

It's by design. I did the same thing once.

From perlop:

?PATTERN?
      This is just like the /pattern/ search, except that it matches
      only once between calls to the reset() operator.  This is a
      useful optimization when you want to see only the first
      occurrence of something in each file of a set of files, for
      instance.  Only ??  patterns local to the current package are
      reset.

           while (<>) {
               if (?^$?) {
                             # blank line between header and body
               }
           } continue {
               reset if eof; # clear ?? status for next file
           }

       This usage is vaguely deprecated, which means it just might
       possibly be removed in some distant future version of Perl,
       perhaps somewhere around the year 2168.

[download]

The solution? Use a different delimiter, but I'm sure you already know that ;)

Replies are listed 'Best First'.
Re^2: Bizarreness in ?PATTERN? and g
by BUU (Prior) on Jun 04, 2004 at 05:06 UTC
    No no no, you're missing my point. I realize that ?? only matches once, but shouldn't the second regex be seperate from the first regex? 
    /regex1/
/regex2/

    [download]
    Regex1 and 2 shouldn't have anything to do with each other, should they? But in my example, the two ??'s are affecting each other, but they're completely seperate!
[reply]
[d/l]

      If you want them separate then remove the g modifier.

      $_="a1 a2 a3";
while(?a(\d)?){ print $1; }
while(?a(\d)?){ print $1; }
__END__
11

      [download]

      Updated to add in the snippet.

[reply]
[d/l]
        I realize that, but why is one affecting the other?
[reply]

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