Re^3: Unexpected interaction between decode

First, I would strongly recommend against using any of the functions from the utf8 module, since these are really only meant for use if one knows the inner workings of how Perl handles Unicode and non-Unicode strings. Second, it seems binmodeing STDIN is not enough - instead, try the open pragma with the :std option <update> since that also sets the default open modes and works on files passed on the command line as well </update>. The following works for me, both for a UTF-8 file piped into perl and a file listed on the command line:

use warnings;
use strict;
use open qw/:std :utf8/;
use HTML::Entities;

while(<>) {
    chomp;
    print lc(decode_entities($_)), "\n";
}
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Update: Added a missing "not", oops :-)

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Re^4: Unexpected interaction between decode_entities() and lc() by ikegami (Patriarch) on Nov 16, 2017 at 19:00 UTC
First, I would strongly recommend against using any of the functions from the utf8 module, since these are really only meant for use if one knows the inner workings of how Perl handles Unicode and non-Unicode strings. That's not true. `utf8::encode` and `utf8::decode` Safe. Used for efficient encoding and decoding. `utf8::upgrade` and `utf8::downgrade` Safe. Used for working around The Unicode Bug. `utf8::is_utf8` AVOID. Only useful when checking code for The Unicode Bug. Any use outside of debugging suffers from The Unicode Bug by definition. Use one of the previously-named functions instead. `utf8::valid` Safe, but extremely limited use (as it checks if scalars are well-formed). It's actually Encode that has the subs you should avoid. `Encode::encode` and `Encode::decode` Safe. Used for encoding and decoding. `Encode::is_utf8` AVOID. Only useful when checking code for The Unicode Bug. Any use outside of debugging suffers from The Unicode Bug by definition. `Encode::_utf8_on` and `Encode::_utf8_off` UNSAFE. There are no reason to ever use these, so NEVER use these. Use one of the utf8:: functions instead. `Encode::_utf8_on($s)` is short for `utf8::decode($s) if !utf8::is_utf8($s);`, which suffers from The Unicode Bug by definition. `Encode::_utf8_off($s)` is short for `utf8::encode($s) if utf8::is_utf8($s);`, which suffers from The Unicode Bug by definition. The Unicode Bug refers to code whose behaviour depends on the internal storage format of a string (i.e. the value returned by `utf8::is_utf8` and `Encode::is_utf8`).	[reply] [d/l] [select]
Re^5: Unexpected interaction between decode_entities() and lc() by haukex (Archbishop) on Nov 16, 2017 at 19:46 UTC
Thanks for clarifying! I knew about `utf8::is_utf8` and `utf8::valid` and I guess I extrapolated too much.	[reply] [d/l] [select]