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<?php $word = 'Sing'; $urls = ['http://I_like_to_sing.mp3', 'http://Another_song.mp3']; $regex = "/https?:\/\/(?=.*$word).+\.mp3/i"; print_r(array_filter($urls, function ($v) use ($regex) { return preg_match($regex, $v); }));
Output for 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.14
Array ( [0] => http://I_like_to_sing.mp3 )

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