PHP正则匹配反斜杠'/'和美元'$'的方法

<?php$content = '1111111<td>2222222<//td>3$';//'//////' 第1个'/'转义字符串的第2个'/'，字符串为'/'//第3个'/'转义第4个'/'，相当于字符串'/'//第5个'/'转义第4个'/'，相当于字符串'/'//字符合起来为'///' 两个'//' 正则表达式看做'/'$pattern = '/<td>([0-9]{7,})<//////td>/d//$$/';$result = preg_match_all($pattern, $content, $match_result);if($result)  print_r($match_result);else  echo("not match");

$content = '1111111<td>2222222<//td>3$';$pattern = "!<td>(/d{7,})</Q///Etd>/d/Q$/E!";$result = preg_match_all($pattern, $content, $m);if($result)  print_r($m);else  echo("not match");

Array(  [0] => Array    (      [0] => <td>2222222<//td>3$    )  [1] => Array    (      [0] => 2222222    ))