What is the significance of the modifiers like "?" in regular expressions in PHP?

The modifiers like "?" in regular expressions in PHP are used to make the matching process more flexible. For example, the "?" modifier makes the preceding token optional, allowing it to match zero or one occurrence. This can be useful when you want to match patterns that may or may not include certain characters or elements. Example: 

// Using the "?" modifier to make the preceding token optional
$pattern = '/colou?r/';
$string = 'color';
if (preg_match($pattern, $string)) {
    echo 'Match found!';
} else {
    echo 'No match found.';
}

Keywords

regular expressions modifiers ? PHP significance

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