#!/usr/bin/perl -wTuse strict;use CGI;use CGIBook::Error;my $DOCUMENT_ROOT = "$ENV{DOCUMENT_ROOT}/";my $VIRTUAL_PATH  = "";my $q     = new CGI;my $regex = $q->param( "regex" );my $query = $q->param( "query" );unless ( defined $query and length $query ) {    error( $q, "Please specify a query!" );}if ( $regex eq "on" ) {    eval { /$query/o };    error( $q, "Invalid Regex") if $@;}else {    $query = quotemeta $query;}my $results = search( $q, $query );print $q->header( "text/html" ),      $q->start_html( "Simple Perl Regex Search" ),      $q->h1( "Search for: $query" ),      $q->ul( $results || "No matches found" ),      $q->end_html;sub search {    my( $q, $query ) = @_;    my( %matches, @files, @sorted_paths, $results );        local( *DIR, *FILE );        opendir DIR, $DOCUMENT_ROOT or        error( $q, "Cannot access search dir!" );            @files = grep { -T "$DOCUMENT_ROOT/$_" } readdir DIR;    close DIR;        my $file;    foreach $file ( @files ) {        my $full_path = "$DOCUMENT_ROOT/$_";                open FILE, $full_path or            error( $q, "Cannot process $file!" );                while ( <FILE> ) {            if ( /$query/io ) {                $_ = html_escape( $_ );                s|$query|<B>$query</B>|gio;                push @{ $matches{$full_path}{content} }, $_;                $matches{$full_path}{file} = $file;                $matches{$full_path}{num_matches}++;            }        }        close FILE;    }        @sorted_paths = sort {                        $matches{$b}{num_matches} <=>                        $matches{$a}{num_matches} ||                        $a cmp $b                    } keys %matches;        my $full_path;    foreach $full_path ( @sorted_paths ) {        my $file        = $matches{$full_path}{file};        my $num_matches = $matches{$full_path}{num_matches};                my $link = $q->a( { -href => "$VIRTUAL_PATH/$file" }, $file );        my $content = join $q->br, @{ $matches{$full_path}{content} };                $results .= $q->p( $q->b( $link ) . " ($num_matches matches)" .                           $q->br . $content                    );    }        return $results;}sub html_escape {    my( $text ) = @_;        $text =~ s/&/&amp;/g;    $text =~ s/</&lt;/g;    $text =~ s/>/&gt;/g;}