help!!!trying to match password

[Luinrandir Hernson]

I have managed to get this far.
I've stripped down 
read(STDIN,$buffer,$ENV{'CONTENT_LENGTH'});
to the actual input, in this case 
bob
and it works.... but so does bob123 , bobbies and bobs_a_bum etc...
Just how do I match the input exactly
bob
to just 
bob
???????

thanks in advance

code below

if ($password  =~m/bob/)
        {
        wholesale()
        }
else
        {
        badpassword()
        }