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Perl: the Markov chain saw

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As dwildesnl suggested, reversing makes it significantly faster: see benchmark below. But don't do the optimisation unless you need it!
my $data = <DATA>; use Benchmark "cmpthese"; cmpthese(10_000, { "reversed" => sub { my %hash; my $reversed_data = reverse($data); $hash{reverse($2)} = reverse($1) while $reversed_data =~ /\s*([^=]+?)\s*=\s*(\w+)/g; }, "non-reversed" => sub { my %hash; my $data = $data; $hash{$1} = $2 while $data =~ s/\s*(\w+)\s*=\s*([^=]+)$//; }, }); __DATA__ option1 = value0 value1 value2 option3 =value3 value4 option2=value5
gives results:
Rate non-reversed reversed non-reversed 1263/s -- -89% reversed 10989/s 770% --

In reply to Re^2: Parsing named parameters by robin
in thread Parsing named parameters by sk

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