php需要正则表达式方面的帮助

Question

I want to parse and expand the given strings in PHP.

From

0605052&&-5&-7&-8
0605052&&-4&-7
0605050&&-2&-4&-6&-8

To

0605052, 0605053 ,0605054 ,0605055, 0605057, 0605058
0605052,0605053,0605054,0605057
0605050,0605051,0605052,0605054,0605056,0605058

can someone help me with that? thanks in advance!

Answer 1

Your question is not very clear, but I think you mean a solution like this:

Edited: Now the hole ranges were shown and not only the specified numbers.

<?php
    $string = "0605052&&-5&-7&-8";
    $test = '/^([0-9]+)\&+/';
    preg_match($test, $string, $res);

    if (isset($res[1]))
    {
        $nr = $res[1];

        $test = '/\&\-([0-9])/';
        preg_match_all($test, $string, $res);

        $result[] = $nr;
        $nrPart = substr($nr, 0, -1);
        $firstPart = substr($nr, -1);

        if (isset($res[1]))
        {
            foreach ($res[1] as &$value)
            {
                if ($firstPart !== false)
                {
                    for ($i=$firstPart+1; $i<=$value; $i++)
                    {
                        $nr = $nrPart . $i;
                        $result[] = $nr;
                    }
                    $firstPart = false;
                }
                else
                {
                    $nr = $nrPart . $value;
                    $result[] = $nr;
                    $firstPart = $value;
                }
            }
        }
        var_dump($result);
    }
?>

This delivers:
result[0] = "0605052"
result[1] = "0605053"
result[2] = "0605054"
result[3] = "0605055"
result[4] = "0605057"
result[5] = "0605058"

Answer 2

I think a multi step approach is the best thing to do here.

Eg take this as an example 0605052&&-5&-7&-8 :

1. Split at - . The result will be 0605052&& , 5& , 7& , 8
2. The first result 0605052&& will help you create your base. Simply substring the numbers by finding first occurence of & and substring to the next to last number. Result will be 060505 . You will also need the last number, so get it as well (which is 2 in this case).
3. Get the remaining ends now, all \\d& are simple to get, simply take the first character of the string (or if those can be more than one number, use substring with first occurence of & approach again).
4. The last number is simple: it is 8 .

Now you got all important values. You can generate your result:

The last number from 2., all numbers from 3. and the number from 4. together with your base are the first part. In addition, you need to generate all numbers from the last number of 2. and the first result of 3. in a loop by a step of 1 and append it to your base.

Example Code:

<?php
$str = '0605052&&-5&-7&-8';
$split = explode('-', $str);

$firstAmpBase = strpos($split[0], '&');
$base = substr($split[0], 0, $firstAmpBase - 1);
$firstEnd = substr($split[0], $firstAmpBase - 1, 1);
$ends = [];

$firstSingleNumber = substr($split[1], 0, strpos($split[1], '&'));
for ($i = $firstEnd; $i < $firstSingleNumber; $i++) {
    array_push($ends, $i);
}
array_push($ends, $firstSingleNumber);

for ($i = 2; $i < count($split) - 1; $i++) {
    array_push($ends, substr($split[$i], 0, strpos($split[$i], '&')));
}
array_push($ends, $split[count($split) - 1]);

foreach ($ends as $end) {
    echo $base . $end . '<br>';
}
?>

Output:

0605052
0605053
0605054
0605055
0605057
0605058