How can PHP developers ensure that both "RÜH J" and "RÜHJ" are marked as a match in the preg_replace function?

To ensure that both "RÜH J" and "RÜHJ" are marked as a match in the preg_replace function, PHP developers can use the 'u' modifier in the regular expression pattern. This modifier enables the pattern to treat the input string as UTF-8 encoded, allowing it to match accented characters or special symbols. 

$string = "RÜH J and RÜHJ are both matches.";
$pattern = '/RÜH\s?J/u';
$replacement = 'replacement';
$result = preg_replace($pattern, $replacement, $string);

echo $result;

Keywords

PHP preg_replace Unicode regex character normalization

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