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my $point = 15;
if ($str =~ /^(.{15})/ && $1 =~ /(regex)$/) {
    print "stuff before pos 15: $1\n";
}

my $point = 15;
my $start = 10;
if (substr($str, $start, $point - $start) =~ /(regex)$/) {
    print "stuff before pos: $1\n";
}

pos $str = 15;
print "matched\n" if $str =~ /\G(?<=regex)/g;