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PHP Regex; extract first matching ID in WordPress shortcode

Having this string

$string = '[gallery link="file" ids="501,502,503,504,505,506,507,508,509"]';

How could I extract the first id in ids?

So far I have succeeded to extract all the ids, then used split;

$output = preg_match_all('/\[gallery.+ids=[\'"](.+?)[\'"]\]/', $string, $matches);
list($extracted) = split(',', $matches[1][0]);

There must be something simpler using only regex, right?

Thanks :)

Solution

  • You could try the below regex to match the first id in id's,

    \[gallery.+ids=\"\K[^,]*

    OR

    \[gallery.+ids=\"\K\d+

    DEMO

    Your PHP code would be,

    <?php
$string = '[gallery link="file" ids="501,502,503,504,505,506,507,508,509"]';
$pattern = '~\[gallery.+ids="\K([^,]*)~';
if (preg_match($pattern, $string, $m)) {
    $yourmatch = $m[0]; 
    echo $yourmatch;
    }
?> //=> 501