Check for double!

Hello,

How to check and delete double entries?

$test = "test|234|wert|234|test"

after the check the result has to be:

$test = "test|234|wert"
mmcwAsked:
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olthoffCommented:
$test = "test|234|wert|234|test";
foreach $Item (split(/\|/, $test)) {
  $Items{$Item} = 0;
};
$test = join('|', keys(%Items));
print($test);
0
prakashk021799Commented:
$test = "test|234|wert|234|test";
for (@fields = split '|', $test) {
    $hash{$_}++;
}
@fields = grep {exists $hash{$_} ? do {delete $hash{$_}; 1;} : undef;} @fields;
$test = join '|', @fields;
0
prakashk021799Commented:
olthoff's answer is fine if you don't need to preserve the order of the fields in the line.
0
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ozoCommented:
`perldoc -q "How can I extract just the unique elements of an array"`
$test = "test|234|wert|234|test";
%hash=();
$test = join '|',grep{!$hash{$_}++} split/\|/,$test;
0
mmcwAuthor Commented:
Question to ozo:

Is it possible to make it so that lowwercae or uppercase doesn't matter and that test and Test is the same!

$test = test|Test|wat

becomes

$test = test|wat
0
ozoCommented:
$test = join '|',grep{!$hash{lc $_}++} split/\|/,$test;
#or, if you don't need to preserve the order or case with olthoff's answer
@Items{split/\|/,lc $test} = ();
$test = join('|', keys(%Items));
0

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