How to create a regular expression?

Question

PHP

Help create a regular expression.
Necessarily, if the $text variable had the value "weather", "time" or "news" (for example), then the $text variable was displayed.
How to implement?

Answer 1

$text = 'погода';
$pattern = '#^(погода|время|новости)$#';

if (preg_match($pattern, $text, $match)) {
    echo $text;
}