How to automate class merging?

Question

css

In general, there is such a code with a repeating class

<input class="dd" maxlength="" class="ss" name="name" value="100" type="hidden"/>

Is there any automated way to convert it to

<input class="dd ss" maxlength="" name="name" value="100" type="hidden"/>

Provided that a lot of such alterations are needed in different index.php files, classes can be inside in a different order and the name of the classes will be different everywhere.
Well, or how else to substitute an additional class as a guideline for which name = "name"

Answer 1

The storm has a regular search and replace. You just need to compose it