$re = '/<(script|style)[^>]*>[\s\S]*?<\/\1>|<\/?[^>]+>/m';
$str = '<div class="my_class">
<div class="copy">
© 2018 Texto
</div>
</div>
<div class="my_class">
<h1>¿como estas?</h1>
<div class="copy">
© 2018 Texto
</div>
<script>
function hola(){
}
</script>
<style>
.red{
background-color: red;
}
</style>
';
$subst = "";
$result = preg_replace($re, $subst, $str);
echo "The result of the substitution is ".$result;
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php