RE: RE: RE: Re: Search Algorithm

Keys in a hash are case sensitive, but nothing says you have to store them in a particular case. Pseudo-workable snippet follows:

foreach (@words) {
    $word_idx{lc($_)} = $position;
}
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The important magic is in lc. You'll have to use lc when you pull values out of the hash, too, or use a tied hash that does this for you.