I have a doubt, The following script is used to read the contents of a file (word by word (or) word preceeded by a number), check for the existence of the matched pattern which is done by the help of bookref() sub, if it is found then the matched pattern is prefixed with the tag . When I run the following script it goes to unending because it is not pointing to the next string after the complete execution of the loop . Please correct me

open IN, "r1.dat";
open OUT, ">r1.txt";
$/=undef;
$line=;
while ($line=~m/([123]?[.s]*[a-z\=.]+)/oi)
{
$book=$1;
print $book,"n";
$t_book=$book;
$t_book=~s/.//g;
$t_book=~s/\l=([a-z]+)\/$1/ig;
$t_book=~s/<(|/)(B|I|SC|U)>//ig;
$quote=bibref($t_book);
if($quote)
{
$line=~s/($book)/$1/ig;
}
}
print OUT $line;
close(IN);
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2006-10-07 Unapproved by planetscape once evidence of habitual plagiarism uncovered.