Programming Forums > Script Programming > Perl

Blackwolf189 · Jun 20th, 2006, 3:51 PM

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

(Toggle Plain Text)

 
$k = ""
while ($k !=~ /hello/i)
{
    $k = <STDIN>;
}

This Works

(Toggle Plain Text)

$k = ""
while (!($k =~ /hello/i))
{
    $k = <STDIN>;
}

My question is whats the difference

Arevos · Jun 20th, 2006, 3:57 PM

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

Infinite Recursion · Jun 20th, 2006, 4:13 PM

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

Jun 20th, 2006, 3:51 PM	#1
Blackwolf189 Newbie Join Date: May 2005 Posts: 10 Rep Power: 0	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 (Toggle Plain Text) $k = "" while ($k !=~ /hello/i) { $k = <STDIN>; } $k = "" while ($k !=~ /hello/i) { $k = <STDIN>; } This Works (Toggle Plain Text) $k = "" while (!($k =~ /hello/i)) { $k = <STDIN>; } $k = "" while (!($k =~ /hello/i)) { $k = <STDIN>; } My question is whats the difference

Jun 20th, 2006, 4:13 PM	#3
Infinite Recursion Programming Guru Join Date: Jul 2004 Location: United States Posts: 3,473 Rep Power: 8	Yep, !~ would work. The other issue was probably due to operator precedence, etc. __________________ http://jasonpowers.net "There are a thousand hacking at the branches of evil to one who is striking at the root."

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Jun 20th, 2006, 3:57 PM	#2
Arevos Programming Guru Join Date: Aug 2005 Location: England Posts: 1,499 Rep Power: 5	It's been a while since I've used perl, but I believe !~ is the correct operator to use.

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Programming Forums > Script Programming > Perl

Determining a negative match