Hi nysus

It's not clear from the question, but if you actually need to filter based on numerical equality, in the case where both the $string_or_number and the array element are numbers, then you can use the following:

use Scalar::Util 'looks_like_number';
#...
my @filtered = grep {
  defined &&
  $string_or_number ne $_ &&
  !(looks_like_number($_) && looks_like_number($string_or_number)
     && $string_or_number == $_)
} @strings_or_numbers;
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That will, for example, filter out elements that are "5" when $string_or_number is "5.0".