Question

(Simplified) code from a WordPress project:

function fix_youtube_links ($content) {
    $append = '&w=480&rel=0';
    $content = preg_replace('/^http:\/\/(?:www\.)?(?:youtube.com\/(?:v\/|watch[\/\#?])|(youtu\.be\/)).*/im', '$0'.$append, $content);
    return $content;
}
add_filter('the_content', 'fix_youtube_links');

$content looks something like this:

blah blah blah



blah blah blah

And I want to add $append to the matches and get this:

blah blah blah



blah blah blah

But instead I am getting this:

blah blah blah


&w=480&rel=0

blah blah blah

…because the end-of-line is being included in the match.

Any suggestions? Regex or non-regex solutions welcomed.

Answer 1

Try this one:

$content = preg_replace('/^http:\/\/(?:www\.)?(?:youtube.com\/(?:v\/|watch[\/\#?])|(youtu\.be\/))[^\n\r]*/im', '$0'.$append, $content);