What is the significance of using the "U" modifier in regular expressions in PHP?

When using regular expressions in PHP, the "U" modifier is significant as it changes the matching behavior from greedy to lazy. This means that the regex engine will try to find the shortest match instead of the longest match. This can be useful when working with patterns that contain multiple matches and you want to match each one separately. 

$string = "Hello World";
$pattern = '/H.*?o/';
preg_match($pattern, $string, $matches);
print_r($matches);

Keywords

PHP regular expressions U modifier significance pattern matching

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