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perl pack question

ningji
User

Dec 12, 2012, 8:38 AM

Post #1 of 6 (3225 views)

perl pack question	Can't Post

say i have a string "0001001101111111",
want to convert it into
"0001-0011-0111-1111",

i can unpack it with "A4" x 4,
then use a for loop to join them.

but thought there's another quick easy way (shift ?) to avoid for loop.
any suggestions ?

thanks !

FishMonger
Veteran / Moderator

Dec 12, 2012, 9:10 AM

Post #2 of 6 (3223 views)

Re: [ningji] perl pack question [In reply to]	Can't Post

See: perldoc -f join
http://perldoc.perl.org/functions/join.html

ningji
User

Dec 12, 2012, 4:11 PM

Post #3 of 6 (3213 views)

Re: [FishMonger] perl pack question [In reply to]	Can't Post

sorry i didn't get the full answer yet.

i can use join,
but if the string changes, some times 12 bits, sometimes 16 bits,
then i can use for loop.

is there a way to avoid it ?

In Reply To

See: perldoc -f join
http://perldoc.perl.org/functions/join.html

Laurent_R
Veteran / Moderator

Dec 12, 2012, 11:17 PM

Post #4 of 6 (3202 views)

Re: [ningji] perl pack question [In reply to]	Can't Post

What about trying this:

Code

s/([01]{4})/$1-/g;

(This post was edited by Laurent_R on Dec 13, 2012, 10:46 AM)

FishMonger
Veteran / Moderator

Dec 13, 2012, 6:36 AM

Post #5 of 6 (3190 views)

Re: [ningji] perl pack question [In reply to]	Can't Post

Code

use strict; 
use warnings; 
 
my @str = qw( 0001001101111111 000100110111 ); 
 
for ( @str ) { 
    print join('-', unpack("A4" x (length($_)/4))), $/; 
}

outputs:
c:\testing>ningji.pl

Quote

0001-0011-0111-1111
0001-0011-0111

ningji
User

Dec 14, 2012, 5:54 PM

Post #6 of 6 (3145 views)

Re: [FishMonger] perl pack question [In reply to]	Can't Post

Thanks everyone, this is cool,
i like Laurant's answer most.

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