Re: Ignore Case when comparing Hash Keys

First transform one of the hashes to use all lowercase keys. Then check existence of lc $other_key.

Here's a Perl 6 solution:

my %lc1 = %hash1.keys>>.lc Z %hash1.values;
for %hash2.keys -> $k {
    say "$k ", %lc1.exists($k) ?? 'Matched' !! 'Did not match';
}
[download]

Transforming the code to Perl 5 shouldn't be too hard.

Perl 6 - second systems done right

Comment on Re: Ignore Case when comparing Hash Keys Select or Download Code

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Re^2: Ignore Case when comparing Hash Keys by avidcoder (Novice) on Nov 15, 2010 at 18:56 UTC
I cant convert the Hash Keys to lower case, because I want to display the Keys and Values Side by side in the output and I want to keep the original Case of the Keys. I was wondering if there is something like if ($a =~ /$search/i) kind of comparison that ignores the case and matches the keys. Also I want the hash to give me the value of the key	[reply]
Re^3: Ignore Case when comparing Hash Keys by roboticus (Chancellor) on Nov 15, 2010 at 19:06 UTC
avoidcoder: I don't advise it, but you could do something like: `%hash1 = ("John", 43, "Paul", 25, "Marie", 22); %hash2 = ("john", 43, "Paul", 25, "marie", 22); while (($KEY_2, $VALUE_2) = each %hash2){ if (grep { m/$KEY_2/i } keys %hash1) { print "$KEY_2 : Matched\n"; } else{ print "$KEY_2 : Did not match\n"; } }` [download] Note: Untested, you can keep all the bits when it breaks, etc. ...roboticus	[reply] [d/l]
Re^4: Ignore Case when comparing Hash Keys by avidcoder (Novice) on Nov 15, 2010 at 19:25 UTC
Robotics Thanks. This works in Key Comparison but how do i get the value of the corresponding Key in the if block? Thanks again.	[reply]
Re^5: Ignore Case when comparing Hash Keys by roboticus (Chancellor) on Nov 15, 2010 at 20:09 UTC
Re^3: Ignore Case when comparing Hash Keys by moritz (Cardinal) on Nov 15, 2010 at 20:03 UTC
I cant convert the Hash Keys to lower case, because I want to display the Keys and Values Side by side in the output and I want to keep the original Case of the Keys. Then use another hash that maps lower case key to the correctly cased key. Also note that the original hash with the correctly cased keys still exists, and stands at your disposal. Perl 6 - second systems done right	[reply]


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