Can it be done in a one-liner

[boshu]

I got an array of email addresses:

@emails = ("sam\@email.com", "john\@email.com", "jenifer\@email.com");

There are 20 txt files wherefrom email addresses are being parsed. The parsed email addresses should be added to the @emails array only if they are not in it.

Example txt file contents:
===========================

Zip_Name: [email][e-mail][/email]
Zip_Name: [email][e-mail][/email]
Zip_Name: [email][e-mail][/email]
Zip_Name: [email][e-mail][/email]

Can it be done in a one-liner (checking and adding non existant array element)

My current code is following, and its not good becasue its adding the new e-mail address even if it is there already.

#READ FILE LIST                                     
foreach my $FILES (@FILES) {                        
		my $file=$FILES;                                
    open(INFO,"$dir\\$file");                       
    my @lines=<INFO>;                               
    foreach my $line (@lines)                       
    {                                               
    	if ($line =~ /^email/){                       
    		($line =~ s/email.//);                      
    		chomp $line;                                
    		if ($line =~ /^(\w|\-|\_|\.)+\@email\.com$/)
    			push (@emails, $line);                    
					}                                         
					else {                                    
						print "e-mail $line in file \"$file\" is
					}                                         
    	}         
         # email addresses come after "Zip_Name:" tag in those   files                            
    	if ($line =~ /^Zip_Name\:(.*)/){              
    			push (@sources, "$1");    		            
    		}                                           
    	                                              
    }                                               
  }

[d5e5]

I don't know how to do it with a one-liner.

The "add only if not already present" requirement is much more easily done by building a hash instead of an array.

#!/usr/bin/perl
use strict;
use warnings;
use 5.010;

my %emails = ('[e-mail]' => undef,
              '[e-mail]' => undef,
              '[e-mail]' => undef);#Hash of emails

while (<DATA>){
    chomp;
    s/^Zip_Name: //;#Remove unwanted text at beginning of $_ (default record variable)
    $emails{$_} = undef; #Email as key in hash automatically unique.
}

say "Hash contains the following emails:";
say foreach (sort keys %emails);

__DATA__
Zip_Name: [e-mail]
Zip_Name: [e-mail]
Zip_Name: [e-mail]
Zip_Name: [e-mail]

This gives the following output:

Hash contains the following emails:
[e-mail]
[e-mail]
[e-mail]
[e-mail]
[e-mail]

[k_manimuthu]

perl -ne 'BEGIN{%email=qw([e-mail] 1 [e-mail] 1 [e-mail] 1 );} 
          /Zip_Name:\s*(.*)/;   $email{$1}=1; 
          END{print "$_:$email{$_}\n" for sort keys %email;}
         ' input_file

Note : The above code tested at linux.

[boshu]

Hmm...
How to test this code?
What is the input file here?

[k_manimuthu]

There are 20 txt files wherefrom email addresses are being parsed.

insist of "input_file" mentioned your ".txt" file.

[boshu]

Hi Muthu,
I could not run it on my windows machine properly.

From Google I found the following references which seems to works, (not 1-liner though)

my %k;
my @def_emails = ("[e-mail]", "[e-mail]", "[e-mail]");
my @r_emails = ("array of emails parsed from the txt files");

map { $k{$_} = 1 } @r_emails;
# merging the elements, only unique emails are pushed
push(@r_emails, grep { !exists $k{$_} } @def_emails);

[k_manimuthu]

Perl one liner scripts single quotes and double quotes may varied linux and windows. Below I modified the code that works at windows.

perl -nle <strong>"</strong>BEGIN{%email=qw([e-mail] 1 [e-mail] 1 [e-mail] 1 );} /Zip_Name:\s*(.*)/; $email{$1}=1; END{print $_ for sort keys %email<strong>"</strong> input_file

[boshu]

Yes, it works now for me as well.
Thanks Muthu.

BR. Boshu