Programming Forums - Determining a negative match

Programming Forums (http://www.programmingforums.org/forumindex.php)

- Perl (http://www.programmingforums.org/forum21.html)

- - Determining a negative match (http://www.programmingforums.org/showthread.php?t=10459)

Determining a negative match

Hey i have a program where i needed to determine if something didnt match.
I originally tried using !=~ but no matter how many times i entered the string to match, it wouldnt work. i eventually replaced it with the not on the outside of the match and it now works. I would like to know why did !=~ fail to do what i wanted.

This doesnt Work

 

$k = ""

while ($k !=~ /hello/i)

{

    $k = <STDIN>;

}

This Works

$k = ""

while (!($k =~ /hello/i))

{

    $k = <STDIN>;

}

My question is whats the difference

It's been a while since I've used perl, but I believe !~ is the correct operator to use.

Yep, !~ would work. The other issue was probably due to operator precedence, etc.