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Postings from January 2012
> From: Abigail
> I don't have anything older than 5.005_04 at the moment, but:
>
> $ /opt/perl/5.005_04/bin/perl -wle 'print qr"-\U\x{20}-"'
> (?-xism:-\X{20}-)
earlier perl do not have 'qr' construct:
D:\>D:\perl-tests\perl-5-004-02\bin\perl.exe -we "print qr/-\U\x{20}-/"
Unquoted string "qr" may clash with future reserved word at -e line 1.
Name "main::qr" used only once: possible typo at -e line 1.
Use of uninitialized value at -e line 1.
Filehandle main::qr never opened at -e line 1.
but:
D:\>D:\perl-tests\perl-5-004-02\bin\perl.exe -we "print qq/-\U\x{20}-/"
- {20}-
the whitespace is actually \x00:
D:\>D:\perl-tests\perl-5-004-02\bin\perl.exe -we "print unpack('H*',qq/-\U\x{20}-/)"
2d007b32307d2d
> So, this issue has been around for a while...
Regards,
Vadim.
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