How can the /is modifier in regular expressions affect the outcome in PHP?

The /is modifier in regular expressions in PHP affects the outcome by making the pattern matching case-insensitive and allowing dot "." to match newline characters. This can be useful when you want to search for a pattern regardless of the case of the letters or when you want to match patterns that span multiple lines. 

// Example of using the /is modifier in a regular expression in PHP
$pattern = '/hello/i'; // case-insensitive match for "hello"
$string = "Hello, world!";
if (preg_match($pattern, $string)) {
    echo "Match found!";
} else {
    echo "No match found.";
}

Keywords

regular expressions /is modifier outcome PHP affect

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