What are some potential pitfalls of using regular expressions (preg_match_all) to search for specific words in email bodies in PHP?

Using regular expressions to search for specific words in email bodies can be inefficient and prone to errors, especially when dealing with complex patterns or large amounts of text. It can also be difficult to maintain and update regex patterns as the requirements change. A more efficient approach would be to use PHP's built-in string functions like strpos or stripos to search for specific words in email bodies. 

// Example of using strpos to search for a specific word in an email body
$email_body = "This is a sample email body containing the word 'example'.";
$word_to_search = 'example';

if (strpos($email_body, $word_to_search) !== false) {
    echo "The word '$word_to_search' was found in the email body.";
} else {
    echo "The word '$word_to_search' was not found in the email body.";
}

Keywords

regular expressions preg_match_all email bodies PHP pitfalls

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