Use eq instead. :) 
my $input = shift;
if($input eq $scalar)
....

[download]
If you really want a regexp for this though, you can use ^ and $ like this: 
$string =~ /^user1$/;

[download]
^ matches only at the beginning of the string, and $ only at the end, so this way you force it to match only if it matches the whole string.
You have moved into a dark place.
It is pitch black. You are likely to be eaten by a grue.

In reply to Re: Exclusive pattern matching.. by Dog and Pony
in thread Exclusive pattern matching.. by Anonymous Monk

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