#!perl

=head2 NAME

Find 504s without bibliographical references

=head2

Input file should be result (export file) from fieldextraction.pl or similar file.
Output file is list of lines matching the desired regular expression.

=cut 

print "Input file: ";
$inputfile = <>;
chomp $inputfile;
$inputfile =~ s/^\"(.*)\"$/$1/;
print "Export file: ";
$exportfile = <>;
chomp $exportfile;
$exportfile =~ s/^\"(.*)\"$/$1/;

open (IN, "<$inputfile") || die ("can't open in");
open (OUT, ">$exportfile") || die ("can't open out");
my $linecount = 0;
while (my $line = <IN>) {
chomp $line;
#remove extra spaces between tabs
$line =~ s/\t\s{7}\@/\t\@/g;
#remove count, tag, and first subfield code
$line =~ s/^\d+?\t\d{3}\s[ \d][ \d]\s\@\w\t//;

#use 'if' for positive, 'unless' for negative, or 'if' + !~
#change back to unless after looking in 500 fields
if ($line =~ /Includes bibliographical references/) {
print OUT "$line\n";
$linecount++;
}
}
close IN;
close OUT;
print "$linecount lines identified\n";
print "Press Enter to quit";
<>;