Re: [perl #24541] substr and utf8 and use bytes

On 23 Nov 2003, at 8:10, Gisle Aas wrote:

> William R Ward (via RT) <perlbug-followup@perl.org> writes:
>
>> We have a need to take a string containing utf8-encoded multibyte
>> characters, and then, treating the string as bytes, extract a
>> substring of N characters from it.
>>
>> This is what "use bytes" was meant for, and it works great on Perl
>> 5.6.1.
>
> "use bytes" is evil.  It exposes internal implementation details that
> you are not supposed to know about and I'm not surprised the results
> differ between versions of perl.
>
> Just use Encode to clearly state your intents in a way that will work
> whatever internal representation of wide chars Perl might have.
> Something like this:
>
>   substr(encode_utf8($string), $m, $n);
>
> will do what you describe above.

Encode isn't available for 5.6.1 though.

Matt.

• [perl #24541] substr and utf8 and use bytes by Karl Williamson via RT
• Re: [perl #24541] substr and utf8 and use bytes by Bill Ward
• [perl #24541] substr and utf8 and use bytes by William R Ward
• Re: [perl #24541] substr and utf8 and use bytes by Gisle Aas
• Re: [perl #24541] substr and utf8 and use bytes by Matt Sergeant
• [perl #24541] substr and utf8 and use bytes by Karl Williamson via RT
• Re: [perl #24541] substr and utf8 and use bytes by SADAHIRO Tomoyuki