$a{foo}{bar} = 'blah';

print "Yep\n" if exists $a{foo} && $a{foo}{bar};
print "Nope\n" if exists $a{bar}{baz};
print "Whoops!\n" if exists $a{bar};

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In reply to Re2: Check for existence in a hash of hashes by dragonchild
in thread Check for existance in a hash of hashes by Perl_User

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