php – preg_match用于多个单词

我想测试一个字符串,看它包含某些单词.

即:

$string = "The rain in spain is certain as the dry on the plain is over and it is not clear";
preg_match('`\brain\b`',$string);

但该方法只匹配一个单词.如何检查多个单词?

就像是:

preg_match_all('#\b(rain|dry|clear)\b#', $string, $matches);
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