3v4l.org

run code in 300+ PHP versions simultaneously
<?php $strings = [ '5,422 Comments, other text here and stuff', '2 Comments, not great!', '4/4/2009 21 Comments', 'This one is a whopper: 1,234,567,890 Comments' ]; foreach ($strings as $string) { echo preg_match('~\d{1,3}(?:,\d{3})*(?= Comments)~', $string, $m) ? $m[0] : 'no match'; echo "\n"; }
Output for 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 - 8.1.29, 8.2.0 - 8.2.20, 8.3.0 - 8.3.8
5,422 2 21 1,234,567,890

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162.25 ms | 403 KiB | 182 Q