PHP + Regular Expression to find the last word in string

Below is the code to find the last word of a string

$pattern = '/[^ ]*$/';
$str = 'Hello world';
preg_match($pattern, $str, $results);

The $results[0] contains last word “world”. If we need to remove or replace the last word use below code.

preg_replace($pattern, '', $str);

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