How can the use of \v as an alternative to \R in regular expressions impact the matching of vertical whitespace characters in PHP?

Using \v as an alternative to \R in regular expressions can impact the matching of vertical whitespace characters in PHP because \v only matches a vertical tab character, while \R matches any vertical whitespace character (including newline, carriage return, and vertical tab). To ensure consistent matching of all vertical whitespace characters, it is recommended to use \R in regular expressions. 

// Using \R to match all vertical whitespace characters
$string = "Line 1\nLine 2\rLine 3\vLine 4";
preg_match_all('/\R/', $string, $matches);
print_r($matches[0]);

Keywords

PHP regular expressions \v \R vertical whitespace characters

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