comment on

Note that if you modify line 8 to

my $ascii_but_utf = '123';
[download]

the output changes to

SV = PV(0x22ae1d0) at 0x2300b20
  REFCNT = 1
  FLAGS = (PADMY,POK,pPOK)
  PV = 0x22d21f0 "123\321\204\321\204\321\204\321\204"\0
  CUR = 11
  LEN = 16
ALL OK
[download]

This is because that UTF is on is just a historical artifact of your initialization.

If we take a look at the two output files generated by these two cases, you'll note that both contain 11 bytes, despite the fact that the byte dump of the UTF-upgraded case should have output 19 bytes. This is because the internal representation of high-bit, 1-byte characters under Perl's implementation of UTF is multi-byte even though they cleanly map to 1-byte characters on output. You wouldn't expect these 1-byte characters to output a wide-character warning any more that you'd expect an ASCII character to.

Second case does look like UTF-8 character string,

You're thinking of that wrong; it could be a UTF character string, or a UTF-8 byte string. When dealing with non-ASCII characters in Perl, rare is the case when you should actually be thinking about Perl's internal representation.

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

In reply to Re^3: Unicode strings internals by kennethk
in thread [SOLVED] Unicode strings internals by vsespb

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		`&`
	<		`<`
	>		`>`
	[		`[`
	]		`]`

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.


No such thing as a small change
	PerlMonks