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% --
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