Zaxo,
I wonder what riz meant by "both @arr & file are big"? I know that demerphq has provided patches to bleed perl for alternation in regexen, but this can get slow quickly in 5.8.x. Ok - let's assume that for some reason a hash isn't an option (order is important) and memory consumption is at a premium already. Is there a way to make it any faster? 
#!/usr/bin/perl
use strict;
use warnings;

my @set = qw(one bright day in the middle of the night);
my %pos;

# Preprocess @set
{
    no warnings 'uninitialized';
    vec( $pos{ ord( $set[ $_ ] ) }, $_, 1 ) = 1 for 0 .. $#set;
}

while ( my $val = <DATA> ) {
    chomp $val;
    my $bitstr = $pos{ ord( $val ) } or next;
    my $i = length( $bitstr ) * 8 - 1;
    while ( $i-- ) {
        print "$val\n" and last if vec($bitstr, $i, 1) && $val eq $set
+[ $i ];
    }
}
__DATA__
one
two
buckle
my
shoe
the
cat
in
the
hat

[download]
I have no idea how well this scales but my guess is it is a failed attempt. I doubt the reciprocal of this solution (indexing file offsets instead) would have been any better. It was a fun experiment anyway.

Cheers - L~R

In reply to Re^2: Looking for function similer to member() in SKILL by Limbic~Region
in thread Looking for function similer to member() in SKILL by riz

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.