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  1. or download this
    # Matches if the string contains a sequence
# of 1 or more lowercase letters
$str =~ /[a-z]+/
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    # Matches if the string consists entirely of
# a sequence of 1 or more lowercase letters,
# optionally followed by a newline
$str =~ /^[a-z]+$/
  3. or download this
    # Matches if the string consists entirely of
# a sequence of 1 or more lowercase letters
$str =~ /^[a-z]+\z/