Say the hash key is BLAH01-A05AFGH. I want the hash key to be BLAH01-A

perl -e'use Data::Dumper; %hash=("BLAH01-A05AFGH0"=>17); for(keys %hash) { if (m/(BLAH\d{2}-\w)/) { $hash{$1} = delete $hash{$_} } }; print Dumper \%hash'

$VAR1 = {
          'BLAH01-A' => 17
        };

[download]

NB there's no check if the new key already exists... it will be overwritten if it does.

Cheers, Sören

Créateur des bugs mobiles - let loose once, run everywhere.
(hooked on the Perl Programming language)

In reply to Re: Replace a hash key if it matches a regex by Happy-the-monk
in thread Replace a hash key if it matches a regex by walkingthecow

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