Match all html tag except `<s></s>` and `<strong></strong>`

gistfile1.txt

### Match all html tag except `<s></s>` and `<strong></strong>` :
- `<(?!\/?(s|strong)(?=>|\s.*>|\/>))\/?.*?>`
- source : https://stackoverflow.com/questions/29869/regex-to-match-all-html-tags-except-p-and-p#answer-2928149
- php
```
<?php
function regexHtmlTags($string)
{
    $arrayTags = ["s", "strong", "em", "p"];
    $pattern = "/<(?!\/?(" . implode($arrayTags, '|') . ")(?=>|\s.*>))\/?.*?>/";
    return preg_replace_callback($pattern, function ($matches) {
        return htmlspecialchars($matches[0]);
    }, $string);
}
```