In the context of PHP, how can the use of modifiers in regular expressions impact the matching process in functions like preg_match?

When using regular expressions in functions like preg_match in PHP, the use of modifiers can impact the matching process by changing how the pattern is interpreted. For example, the 'i' modifier makes the pattern case-insensitive, while the 'm' modifier allows the pattern to match the beginning and end of each line in a multi-line string. To ensure the desired matching behavior, it's important to carefully choose and apply the appropriate modifiers. 

// Example of using the 'i' modifier to make the pattern case-insensitive
$string = "Hello World";
$pattern = "/hello/i";

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

Keywords

PHP regular expressions modifiers preg_match matching process

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