Perhaps something like this:

my $counter;
foreach(@rootwords){
   $counter++;
   $_ .= "\n";
   if($_ =~ /(\b$input\b)/){
      print "Found match on line number $counter\n";
   }
}

At least I think that's what you're looking for. 

-----Original Message-----
From: viswanathan sundararajan
To: [EMAIL PROTECTED]
Sent: 3/21/02 9:14 PM
Subject: Regarding reg. expr

Hi group,
        I  have the following code.             

$in=join("\n",@rootwords);
while($in=~/(\b$input\b)/g)
{
 .....
 .....
}

Is there any way of finding out the line no where
$input is matched with $in.$in may contains many
instances of $in.I need all those line nos.

Thanx in advance,
visu

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