How can delimiters and modifiers affect the functionality of regular expressions in PHP?

Delimiters and modifiers in regular expressions can affect the functionality of the pattern matching. Delimiters define the start and end of the regular expression pattern, while modifiers can change how the pattern is interpreted. To ensure proper functionality, it is important to choose appropriate delimiters and modifiers based on the specific requirements of the regular expression. 

// Example of using delimiters and modifiers in PHP regular expressions
$pattern = '/hello/i'; // Using '/' as delimiters and 'i' modifier for case-insensitive matching
$string = 'Hello, World!';
if (preg_match($pattern, $string)) {
    echo 'Match found!';
} else {
    echo 'No match found.';
}

Keywords

delimiters modifiers regular expressions functionality PHP

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