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$ perl -MData::Dumper -e 'print Dumper(       "abbbbc"=~/b/    )'
$VAR1 = 1;
...
$VAR2 = 'b';
$VAR3 = 'b';
$VAR4 = 'b';

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$ perl -MData::Dumper -e 'print Dumper(scalar(()="abbbbc"=~/b/g))'
$VAR1 = 4;
$ perl -MData::Dumper -e 'print Dumper(scalar(()="abbbbc"=~/(b)/g))'
$VAR1 = 4;