How can you modify a regular expression pattern to allow for case-insensitive matching in PHP?

To allow for case-insensitive matching in PHP regular expressions, you can add the 'i' modifier at the end of the pattern. This modifier tells PHP to perform a case-insensitive match when applying the regular expression pattern. 

$pattern = '/hello/i';
$string = 'Hello, World!';
if (preg_match($pattern, $string)) {
    echo 'Match found!';
} else {
    echo 'No match found.';
}

Keywords

regular expression pattern case-insensitive matching PHP modify

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