php使用正则表达式进行字符串搜索的方法

<?php
$string_to_search = "jb51.";
$regex = "/tor/";
$num_matches = preg_match($regex, $string_to_search);
 
if ($num_matches > 0) {
 echo "Found a match!";
} else {
 echo "No match. Sorry.";
}
?>