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<?php $input = 'https://someurl.com "This is a \"quote\" in the caption"'; list($url, $caption)=(preg_match('~(\S+) "(.+)"~', $input, $out) ? array_slice($out,1) : ['','']); echo "url: $url\ncaption: $caption";
Output for 7.1.0 - 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 - 8.1.34, 8.2.0 - 8.2.32, 8.3.0 - 8.3.32, 8.4.1 - 8.4.23, 8.5.0 - 8.5.8
url: https://someurl.com caption: This is a \"quote\" in the caption

preferences:
99.95 ms | 1491 KiB | 4 Q