Hi loody,
On Sun, Nov 17, 2013 at 10:06 AM, loody <[email protected]> wrote:
> hi all:
> I try to eliminate below special character "^@" by perl in the attachment.
>
> I have tried "$.*^' regular expression for elimination in perl but fail
>
It would have been lovely to see how you tried that.
>
> Have anyone got the experience to eliminate such special character?
> (below are excerpted from the attachment)
>
> appreciate your help,
>
Using perl The substitution operator i.e s///g , could help. like so:
[CODE]
use warnings;
use strict;
my $str = do {
local $/;
<DATA>;
};
$str =~ s/\^@//g; # note here
print $str;
__DATA__
itd_submit 33189226 1 urb d7c54800 ep2in len 5120, 10 pkts 8 uframes
[dbab8900]
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@itd_submit
33190819 1 urb d7c54a00 ep2in len 5120, 10 pkts 8 uframes [dbab8900]
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ehci_urb_done
33205223 1 urb d7c54800 ep2in status 0 0
itd_submit 33205506 1 urb d7c54800 ep2in len 5120, 10 pkts 8 uframes
[dbab8900]
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ehci_urb_done
33215263 1 urb d7c54a00 ep2in status 0 0
[/CODE]
You could check:
http://perldoc.perl.org/perlop.html#Regexp-Quote-Like-Operators
>
> itd_submit 33189226 1 urb d7c54800 ep2in len 5120, 10 pkts 8 uframes
> [dbab8900]
>
> ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@itd_submit
> 33190819 1 urb d7c54a00 ep2in len 5120, 10 pkts 8 uframes [dbab8900]
>
> ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ehci_urb_done
> 33205223 1 urb d7c54800 ep2in status 0 0
> itd_submit 33205506 1 urb d7c54800 ep2in len 5120, 10 pkts 8 uframes
> [dbab8900]
>
> ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ehci_urb_done
> 33215263 1 urb d7c54a00 ep2in status 0 0
>
>
> --
> Regards,
>
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> http://learn.perl.org/
>
>
--
Tim
