Whoops. I misread the question. This finds the key tag "5163" and then finds the next eight numbers with optional interspersed whitespace.

my ($number) = $str =~ /5163((?:\s*\d){8})/
# Extract all numbers and whitespace including punctuation frequently 
+significant to numbers
my $numbers = join ' ', $str =~ /([\d .-+]+)/g;

# Less whitespace
$numbers =~ s/(\s)\1+/$1/g;

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In reply to Re: How to write a regular expression to extract a number from an embedded string? by diotalevi
in thread How to write a regular expression to extract a number from an embedded string? by jwking

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