Re: Bit operation

1. if usage of $a |= 0x00000008; is right ?

Yes. All you have to do is try it:

use strict; 
use warnings; 

my $val = 0xffff_fff0;
printf "%x\n", $val;
$val |= 0x0000_0008;
printf "%x\n", $val;

__END__

fffffff0
fffffff8
[download]

Side note: don't use $a as a variable name as it has special significance in Perl (sort).

2. how extract hex value by Regular Expression from string I have : For example:

You can use the [[:xdigit:]] character class to extract hex values. See perlre.

Comment on Re: Bit operation Select or Download Code

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Re^2: Bit operation by toren (Novice) on Jan 12, 2011 at 15:13 UTC
Thanks, On my system its look like `my $val = 0xffff_fff0; printf "%x\n", $val; $val \|= 0x0000_0008; printf "%x\n", $val;` [download] `fffffff0 8` [download]	[reply] [d/l] [select]
Re^3: Bit operation (perl version/OS) by toolic (Bishop) on Jan 12, 2011 at 15:31 UTC
What version of perl are you using? `perl -v This is perl, v5.8.8 built for MSWin32-x86-multi-thread` [download]	[reply] [d/l]
Re^3: Bit operation by ikegami (Patriarch) on Jan 12, 2011 at 18:23 UTC
Please double check. Are you sure that's exactly the code you ran? If so, please provide the output of `perl -V`. (That's an uppercase "V".)	[reply] [d/l]