I need some help on removing the middle chars and leave the first 5 characters and last 5 characters using regex

i want this output

0x388c ... b19297

but am getting this error Use of uninitialized value $_ in pattern match (m//)

my $char = "0x388c818ca8b9251b393131c08a736a67ccb19297";
my($output) = $char = /^(?<=\S{5})\S(?=\S{7})/;

print $output;

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In reply to remove chars with regex by frank1

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