php使用正则表达式进行字符串搜索的方法

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<?php

$string_to_search = "jb51.net";

$regex = "/tor/";

$num_matches = preg_match($regex, $string_to_search);

if ($num_matches > 0) {

echo "Found a match!";

} else {

echo "No match. Sorry.";

}

?>