Perl 5 version documentation


  • length EXPR

  • length

    Returns the length in characters of the value of EXPR. If EXPR is omitted, returns the length of $_ . If EXPR is undefined, returns undef.

    This function cannot be used on an entire array or hash to find out how many elements these have. For that, use scalar @array and scalar keys %hash , respectively.

    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('UTF-8', EXPR)) (you'll have to use Encode first). See Encode and perlunicode.