How can regular expressions be used to improve the accuracy of keyword highlighting in PHP?

Regular expressions can be used to improve the accuracy of keyword highlighting in PHP by allowing for more complex pattern matching. By using regular expressions, you can define specific rules for matching keywords, such as case sensitivity, word boundaries, and variations of the keyword. This can help ensure that only the exact keyword is highlighted and not partial matches or similar words.

// Keyword to highlight
$keyword = "example";

// Text to search for keyword
$text = "This is an example of how regular expressions can improve keyword highlighting.";

// Use regular expression to highlight keyword with word boundaries
$highlighted_text = preg_replace("/\b" . preg_quote($keyword) . "\b/i", "<strong>$0</strong>", $text);

echo $highlighted_text;