i had a perl script that traverses throuh the file hirarchy and searches for a particular string and gives the count of files the string is present,the problem is when the search string contains '.' the match is not being done ...please help

$string="hai hello hello.doc
yes hai hello.doc present in 
the file";
$oldstring="hello.doc";
if($string=~ m/\Q$oldstring\E/){
           print "\nstring found in ...\n$File::Find::name";
           $i++;
        }

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i am taking $oldstring from command line argunments and $string is contents of file i even tried "hello\.doc"but the match is not being done

In reply to need helpo regarding regular expression by praveenchappa

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