Hello monks,

I have data like

<i><ce:bib-reference id="bib1">
<ce:other-ref>
<ce:textref>Adolophs R (2002), Trust in the brain. Nat Neurosci 5(3):1
+92-193.</ce:textref></ce:other-ref>
</ce:bib-reference>

<ce:bib-reference id="bib2">
<ce:other-ref>
<ce:textref>American Psychiatric Association. Diagnostic and Statistic
+al Manual of Mental Disorders, (4<ce:sup>th</ce:sup> ed., text revisi
+on). Washington, DC: Author, 2000.</ce:textref></ce:other-ref>
</ce:bib-reference>

<ce:bib-reference id="bib3">
<ce:other-ref>
<ce:textref>Amici R, Zamboni G, Perez E, Jones CA, Parmeggiani PL (199
+8), The influence of a heavy thermal load on REM sleep in the rat. Br
+ain Res 781:252-258.</ce:textref></ce:other-ref>
</ce:bib-reference> </i>
[download]

What I want to do is to add "<ce:label>Data before first comma</ce:label> after each "<ce:bib-reference id="bib\d">"

I have written a script for this, but finally when i try to replace the data in file script freezes

use warnings;
use strict;
use Cwd;


my $dir=getcwd;
print "$dir\n";


opendir DIR, $dir or die "cant open dir";
my @files = grep /mlx/,(readdir DIR);  
closedir DIR;

foreach my $file (@files) {

    open(INF, $file)  or die "cannot open $file: $!\n";  
    my $fdata=join("", <INF>); 
    close INF;
    ##<ce:bib-reference id="bib2">...  </ce:bib-reference>
    while ($fdata=~m{(<ce:bib\-reference id\=\"bib[0-9]+\">\n)(.*?)(<\
+/ce:bib\-reference>)}sg){
        my $bib=$1;
        
        my $label=ExtractAuth($&);
        
        $fdata=~s/(\Q$bib\E)/$1$label/;    
    }
print "$fdata";
}


sub ExtractAuth{
    my $bib=shift;
    my $auth="";
    my $label="";
    ##<ce:textref>...</ce:textref>
    while ($bib=~m{<ce:textref>(.*?)<\/ce:textref>}sg){
        $auth=$1;
        if ($auth=~m{\(\d{4}[A-z]?\)}){
            my $count= ($auth =~ tr/\,//);
            
            $label=AddLabel($auth,$count);
            #$bib=~s/(<ce:bib\-reference id\=\"bib[0-9]+\">\n)/$1$labe
+l/;
            
        }else {
            $label="Year Not Found\n";
            #$bib=~s/(<ce:bib\-reference id\=\"bib[0-9]+\">\n)/$1$labe
+l/;
        }
    
    
    }

    #$bib=~s/(<ce:bib\-reference id\=\"bib[0-9]+\">\n)/$1$label/g;

return ($label);
}


sub AddLabel{
    my $auth=shift;
    my $count=shift;
    my $fauth="";
    my $year;
    my $labelst="";
    
    if ($count<=1){
    
        if ($auth=~m{(.*?)(\(\d{4}[A-z]?\))}){
            $fauth=$1;
            $year=$2;
            $fauth=~s/\s$//;
            $labelst="<ce:label>$fauth\, $year<\/ce:label>\n";
        }
    
    }

return ($labelst);

}
[download]

Whats going wrong in this code?