What are some potential pitfalls of using soundex() to filter out unsavory words in text?

Using soundex() to filter out unsavory words in text may not be effective as it is primarily designed for phonetic matching, which can lead to false positives or negatives. A better approach would be to use a more advanced text processing technique like natural language processing or regular expressions to accurately identify and filter out inappropriate words.

// Example of using regular expressions to filter out unsavory words
$text = "This is a sample text with unsavory words like badword1 and badword2.";
$filtered_text = preg_replace('/\b(badword1|badword2)\b/i', '***', $text);
echo $filtered_text;