Php regular expressions cannot contain certain characters.

Php regular expressions cannot contain certain characters, such as my original regular: & lt; ignore_js_op & gt; [\ s \ S] *? The problem is that another character including & lt; ignore_js_op & gt; is obtained in the middle. How to write the string ignore_js_op that is no longer included? Php regular expressions cannot contain certain characters.
For example, my original regular expression:
[\ S \ S] *?

The problem is that another section contains . How to write the string ignore_js_op that is no longer included?
------ Solution --------------------
Use preg_replace_callback () to first match and then replace it with
------ Solution --------------------
Do not use regular expressions instead of dom for parsing.
Http://php.net/manual/en/book.dom.php