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Php – I need help for a specific regular expression

In my test there is following data

>0 Dollar</span
>0.01 Dollar</span
>0.00 Dollar</span 
>50.00 Dollar</span

My desire:

I want to differentiate dollar which is not 0.00 Dollar and 0 Dollar

Code that I am using

$str = $table['contents'];
$pattern = "/(Need help here)/";    
$a = preg_match_all($pattern, $str, $matches);
print_r($matches);

Output should be an array whose value will be:

0.01 Dollar and 50.00 Dollar

Could you help me?

Tags:

2

Answers


  1. 0

    You want to use the Lookaround, specially negative lookahead.

    $pattern = '#>((?!0.00)[0-9.]+s+Dollar)<#';
$a = preg_match_all($pattern, $str, $matches);
print_r($matches);

    Output:

    Array
(
    [0] => Array
        (
            [0] => >0.01 Dollar<
            [1] => >50.00 Dollar<
        )

    [1] => Array
        (
            [0] => 0.01 Dollar
            [1] => 50.00 Dollar
        )

)
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  2. 0

    You could make use of DOMDocument and DOMXPath and use preg_match as a PhpFunction inside a xpath query.

    In the example I have used //span which will get all the spans, but you can make the query more specific to your data.

    $html = <<<HTML
<span>0 Dollar</span>
<span>0.01 Dollar</span>
<span>0.00 Dollar</span>
<span>50.00 Dollar</span>
HTML;

$dom = new DOMDocument;
$dom->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);

$xp = new DOMXPath($dom);
$xp->registerNamespace("php", "http://php.net/xpath");
$xp->registerPHPFunctions('preg_match');
$pattern = '/A(?=[0.]*[1-9])d+(?:.d+)?+h+Dollarz/';
$spans = $xp->query("//span[php:functionString('preg_match', '$pattern', text())>0]");

foreach ($spans as $span) {
    echo $span->nodeValue . PHP_EOL;
}

    Output

    0.01 Dollar
50.00 Dollar

    See a PHP demo

    If you want to use a regex only, you could match the leading > and assert the trailing <. If the previous code example, A and z are anchors that assert the start and the end of the string.

    >K(?=[0.]*[1-9])d+(?:.d+)?+h+Dollar(?=<)

    The pattern matches:

    • > Match literally
    • K Forget what is matched so far
    • (?=[0.]*[1-9]) Positive lookahead, assert at least a digit 1-9 preceded by optional zeroes or dots
    • d+(?:.d+)?+ Match 1+ digits with an optional decimal part
    • h+Dollar
    • (?=<) Positive lookahead, assert < to the right

    Regex demo | Php demo

    For example:

    $data = <<<DATA
>0 Dollar</span
>0.01 Dollar</span
>0.00 Dollar</span 
>50.00 Dollar</span
DATA;
$regex = '/>K(?=[0.]*[1-9])d+(?:.d+)?+h+Dollar(?=<)/';
preg_match_all($regex, $data, $matches);
var_export($matches[0]);

    Output

    array (
  0 => '0.01 Dollar',
  1 => '50.00 Dollar',
)
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