What are some potential reasons for a regex pattern to work on a website but not in a PHP script?

The potential reasons for a regex pattern to work on a website but not in a PHP script could be due to differences in how the regex engine handles certain characters or syntax, or differences in how the regex pattern is implemented in the website versus the PHP script. To solve this issue, you can try escaping special characters in the regex pattern, or adjusting the syntax to match the PHP regex engine's requirements. 

// Example of adjusting a regex pattern to work in PHP script
$pattern = '/\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b/';
$string = 'example@email.com';

if (preg_match($pattern, $string)) {
    echo "Valid email address";
} else {
    echo "Invalid email address";
}

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