The following code, scaled up to 500,000 filenames and 100,000 IDs, takes 2 seconds to run and uses 90Mb approx.
use warnings;
use strict;
# create some sample data
my (@pathnames, @safe_list);
push @pathnames, sprintf "C:/abc/abc1/GS%06d", $_ for 1..500_000;
push @safe_list, sprintf "GS%06d", $_ for 1..100_000;
my %safe_hash;
$safe_hash{$_} = 1 for @safe_list;
my @list;
for (@pathnames) {
# (adjust regex to match whatever the filename/ID format is)
/\/(\w+)$/ or die "bad pathname: $_";
push @list, $_ unless $safe_hash{$1};
}
Dave.
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|
