PHP preg_match returns null. Why?

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The following preg_match call returns null within a WordPress code: 

preg_match('/(<div class="title-primary">)([^<]*)(</div>)/', $content, &$matches)

Even if the input contains: <div class="title-primary"> bla-bla </div>.

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There are no PHP errors.

This works well when tested with online tools:

Result: 

Array
(
    [0] => <div class="title-primary">
                     bla-bla            </div>
    [1] => <div class="title-primary">
    [2] =>
                     bla-bla
    [3] => </div>
)

Any idea what might be the problem?

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1 comment

  1. This indeed works well when testing with online tools or my own environment. Submitted at http://phptester.net/

    <?php
$content = '<div class="title-primary"> bla-bla </div>';

preg_match('/(<div class="title-primary">)([^<]*)(</div>)/', $content, &$matches);

print_r($matches);

    Result:

    Array ( [0] =>
bla-bla
[1] =>
[2] => bla-bla [3] =>
)

    Which means that it must be something else in your code that prevents this from running properly. First thing that I would look at would be why you are using pass-by-reference operator with $matches – is there a chance that $matches gets over-written somewhere in between the preg_match and the point at which you are debugging the code?

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