It is shorter, but this is better if you might have = in your value:

echo "BLAH=VALUE ONE" | perl -pe 's/.*?=//'
echo "BLAH=KEY=VALUE" | perl -pe 's/.*?=//'

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I wrote:
> echo "BLAH=VALUE ONE" | perl -anF'=' -e "print pop(@F)"

This is shorter:

echo "BLAH=VALUE ONE" | perl -pe "s/.*=//"

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