in reply to deleting multiple hash keys

You should read about Slices.

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Re^2: deleting multiple hash keys
by AnomalousMonk (Archbishop) on Mar 01, 2009 at 03:10 UTC
    And with reference to delete, quoth the docs (emphasis added):
    delete EXPR

    Given an expression that specifies a hash element, array element, hash slice, or array slice, deletes the specified element(s) from the hash or array.

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