Returns the length in characters of the value of EXPR. If EXPR
is omitted, returns the length of . If EXPR is undefined,
returns Like all Perl character operations, length() normally
deals in logical characters, not physical bytes. For how many
bytes a string encoded as UTF-8 would take up, use
length(Encode::encode_utf8(EXPR)) (you'll have first). See
Encode and perlunicode.