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[SOLVED] 2 beginner questions

HaHaMan
New User

Aug 16, 2012, 9:26 AM

Post #1 of 7 (1846 views)

[SOLVED] 2 beginner questions	Can't Post

First of all, sorry for my english ;)

I got two questions:

1) I have a variable which contains a hexadecimal number, for example:
3e5c4685da

I want to print it as '3e 5c 46 85 da'. In other words, to use a space separator every two hexadecimal numbers. How can I do that?

2) I was trying to use Regular Expressions but I still get a null variable. I got a string like this:
'%SystemDrive%\Documents and Settings\XXXXX'

I want to save the 'XXXXX' in a variable, and I know that is always after the last backslash (\).

I tried this:

Code

$owner = %SystemDrive%\Documents and Settings\LocalService; 
$owner =~ tr/[\\.*$]//;

But when I print it, $owner contains no data. Any solution?

Thanks!!

(This post was edited by HaHaMan on Aug 16, 2012, 12:35 PM)

FishMonger
Veteran / Moderator

Aug 16, 2012, 9:56 AM

Post #2 of 7 (1840 views)

Re: [HaHaMan] 2 beginner questions [In reply to]	Can't Post

Code

my $hex = '3e5c4685da'; 
$hex = join(' ', $hex =~ /(..)/g); 
 
print $hex, $/;

Code

use File::Basename; 
 
my $path = '%SystemDrive%\Documents and Settings\XXXXX'; 
my $file = basename($path); 
 
print $file, $/;

Laurent_R
Veteran / Moderator

Aug 16, 2012, 10:00 AM

Post #3 of 7 (1839 views)

Re: [HaHaMan] 2 beginner questions [In reply to]	Can't Post

tr// does not deal with regular expressions and will not lead you anywhere near where you want to go.

Code

my $XXX = $1 if $line =~ m{([^\\]+)$};

For the other on e, I'll come back later, it is a bit more difficult than you think.

(This post was edited by Laurent_R on Aug 16, 2012, 10:15 AM)

Laurent_R
Veteran / Moderator

Aug 16, 2012, 10:24 AM

Post #4 of 7 (1835 views)

Re: [HaHaMan] 2 beginner questions [In reply to]	Can't Post

Well contrary to what I said just earlier, the hex one is also fairly easy. I was thinking of a similar problem, separating the thousands by a comma in a number (e.g. to obtain 56,786,564), which turns out to be a bit tricky.

Here, a simple regex like this one will do it.

Code

my $hex_nr = "'3e5c4685da'; 
$hex_nr =  =~ s/(.{2})/\1 /g;

HaHaMan
New User

Aug 16, 2012, 12:39 PM

Post #5 of 7 (1826 views)

Re: [HaHaMan] [SOLVED] 2 beginner questions [In reply to]	Can't Post

Thanks guys, finally got my script working ;)

@Lauren
I was traying to do the same as this page says:
http://www.troubleshooters.com/codecorn/littperl/perlreg.htm#DoingTranslations

Maybe it is outdated or I did wrong

Laurent_R
Veteran / Moderator

Aug 16, 2012, 1:47 PM

Post #6 of 7 (1822 views)

Re: [HaHaMan] [SOLVED] 2 beginner questions [In reply to]	Can't Post

I think you understood it wrong.

The tr// function is powerful, but is not doing regexes, but simple character substitution.

FishMonger
Veteran / Moderator

Aug 16, 2012, 1:51 PM

Post #7 of 7 (1819 views)

Re: [HaHaMan] [SOLVED] 2 beginner questions [In reply to]	Can't Post

The example given in that "tutorial" was wrong and misleading.

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