note
NetWallah
<blockquote>
<i> Is it possible to check a variable against all the keys in a hash</i>
</blockquote>
The question suggests you do not understand the fundamental property of a hash.<p>
The primary use of a hash is for a quick and simple lookup of a 'key', by indexing, using curly-braces.<p>
The first line of your code:
<c>
if (! exists ($hash{$remoteIP})){
</c>
does exactly that - looks up the value of $remoteIP, and can be thought of as comparing with every possible key in %hash, and returning 'true' if the matching one exists.<p>
Your later comparison:
<c>
if ($remoteIP ~~ @k){
</c>
is a more expensive way of doing the same comparison that the first line does.
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<p> <small>
"By three methods we may learn wisdom: First, by reflection, which is noblest; Second, by imitation, which is easiest; and third by experience, which is the bitterest."
-Confucius
</small></p>
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