$bin =~ m{([01]+)};     # untaint input
my $idx = eval "0b$1";

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  1. You shouldn't use the results of a regular expression unless you verify that it matched correctly.
  2. Why use string eval when oct is less dangerous and provides the same result.

In reply to Re^2: Reading Binary by jwkrahn
in thread Reading Binary by BoulderBuff64

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