Substr cannot extract last special character

juo has asked for the wisdom of the Perl Monks concerning the following question:

I noticed when using substract it cannot work to extract the last character if that last character is a special symbol. For example (microns,ohm,...) Ù If I have a string like : 24Ù and I want to get the unit of that string and use :

my $ohm = '24Ù';
$unit = substr $ohm, -1; 
print "$unit\n";  # This will return a ? in my CMD be aware that you c
+annot see the Ohm character
[download]

Does anybody have any idea how to resolve this. I noticed in a previous post state that we could use the Hex code to do things like this (\x{00A1}) but does anybody has any idea how to get the HEX code for a given special symbol? I found Unibook rather difficult to get the right code, as it is looking in a labyrinth for the right one.

Retitled by davido from 'Substract cannot extract last special character'.

Comment on Substr cannot extract last special character Download Code

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Re: Substr cannot extract last special character by Samy_rio (Vicar) on Aug 19, 2005 at 03:54 UTC
Hi, If i understood your question correctly, here is my coding: `my $ohm = '24Ù'; print "Before substract : $ohm"; if ($ohm =~ /[^!-~\s]/g)#This helps to find the non ascii character { $unit=$&; $ohm=~s/$unit//e; } print "\nUnit : $unit\nAfter substract : $ohm"; # This will return a +? in my CMD be aware that you cannot see the Ohm character` [download] I think it helps you. Regards, Velusamy R.	[reply] [d/l]
Re^2: Substr cannot extract last special character by Samy_rio (Vicar) on Aug 19, 2005 at 05:59 UTC
Sorry juo, I misunderstood the question, here is my suggestion: `my $ohm = '24Ù 34Ã 234Æ 32Ï 23Ð 1½ 23§'; print "Before substract : $ohm\n"; while ($ohm =~ /[^!-~\s]/g)#This helps to find the non ascii character { $unit=$&; $ohm=~s/$unit//e; $foo ='&#x'.sprintf("%04X",ord($unit)).";"; print "Unit : $unit\tHex : $foo\n"; }` [download] In CMD, display the following hexadecimal values: `Hex : Ù Hex : Ã Hex : Æ Hex : Ï Hex : Ð Hex : ½ Hex : §` [download] These hexadecimal values are viewed in IE as HTML and XML file, I am getting exact symbol which are present in the code. Please, try this. Regards, Velusamy R.	[reply] [d/l] [select]
Re: Substr cannot extract last special character by newroz (Monk) on Aug 19, 2005 at 08:09 UTC
Hi, It shows Ù, when used -2 offset, due of two byte length of unicode chars. `#!/usr/bin/perl my $ohm = qw(24Ù); $unit = substr $ohm,-2; print "$unit","\n";` [download]	[reply] [d/l]
Re^2: Substr cannot extract last special character by dave_the_m (Monsignor) on Aug 19, 2005 at 10:45 UTC
In particular, if you embed utf8 chars in the program source, you have to let perl know with the utf8 pragma: `my $x ='Ù'; print length($x), "\n"; # prints 2` [download] compared with `use utf8; my $x ='Ù'; print length($x), "\n"; #' prints 1` [download] Dave.	[reply] [d/l] [select]