elixir string regex
iex> String.match?("123", ~r/^[[:alnum:]]+$/)
true
iex> String.match?("123 456", ~r/^[[:alnum:][:blank:]]+$/)
true
elixir string regex
iex> String.match?("123", ~r/^[[:alnum:]]+$/)
true
iex> String.match?("123 456", ~r/^[[:alnum:][:blank:]]+$/)
true
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