How can the lack of word boundary support for UTF-8 encoded text in regular expressions impact the accuracy of search results in PHP?

The lack of word boundary support for UTF-8 encoded text in regular expressions can impact the accuracy of search results in PHP by causing incorrect matches or missing relevant results when searching for words in languages with non-ASCII characters. To solve this issue, we can use the \b metacharacter in regular expressions to match word boundaries for UTF-8 encoded text. 

$text = "Привет мир";
$word = "мир";

if (preg_match("/\b" . preg_quote($word, "/") . "\b/u", $text)) {
    echo "Word found in text.";
} else {
    echo "Word not found in text.";
}

Keywords

UTF-8 regular expressions word boundary search results accuracy

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