How can the use of regular expressions be optimized in template scripts to avoid unnecessary complexity and inefficiency?

Regular expressions can be optimized in template scripts by avoiding unnecessary complexity and inefficiency. One way to achieve this is by using more specific and targeted patterns instead of generic ones. Additionally, it is important to avoid unnecessary backtracking by optimizing the structure of the regular expressions. By carefully crafting the patterns to match only what is needed, the performance of the regular expressions can be improved.

// Example of optimizing regular expressions in a template script
$template = "Hello, {{name}}! Your email is {{email}}.";
$data = ['name' => 'John', 'email' => 'john@example.com'];

// Using specific patterns to match only the placeholders
$pattern = '/{{(name|email)}}/';
$replace = function ($matches) use ($data) {
    return $data[$matches[1]] ?? '';
};

echo preg_replace_callback($pattern, $replace, $template);