How can PHP beginners effectively use regular expressions to highlight search terms in a forum without causing unintended side effects?

When highlighting search terms in a forum using regular expressions, beginners should be cautious to avoid unintended side effects such as breaking HTML tags or highlighting partial words. To address this, beginners can use the preg_replace function with the 'word boundary' (\b) anchor to ensure that only whole words are matched for highlighting. 

// Example code snippet to highlight search terms in a forum
$search_query = "PHP";
$forum_post = "I love programming in PHP and creating dynamic websites.";

$highlighted_post = preg_replace('/\b(' . preg_quote($search_query, '/') . ')\b/i', '<span style="background-color: yellow;">$1</span>', $forum_post);

echo $highlighted_post;

Keywords

PHP regular expressions search terms forum unintended side effects

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