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What are the key modifiers or options to consider when using regular expressions in PHP for search functionality?

When using regular expressions in PHP for search functionality, key modifiers or options to consider include case-insensitivity, multiline matching, and global matching. These modifiers can help customize the search behavior to better fit the requirements of the search functionality.

php 
// Example of using key modifiers in regular expressions for search functionality
$search_term = "example";
$pattern = "/$search_term/i"; // Case-insensitive matching
$string = "This is an example string. Example is used for demonstration purposes.";

if (preg_match($pattern, $string)) {
    echo "Match found!";
} else {
    echo "No match found.";
}

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