Workflow to change state if comment contains resolved

I am having problems to create a custom workflow to change the state based on comments. My current issue with the workflow is that the keyword has to be the first word. I would like it to search the entire comment for this keyword. I have tried comments.added.contains("Resolved") but this doesn't work.

Here is my current workflow:

when comments.added.isNotEmpty {
  if (comments.last.author.isInGroup("helpdesk") && comments.added.first.text == "Resolved") {
    State = {Fixed};
  } else if (comments.last.author.isInGroup("helpdesk") {
    State = {In Progress};
  } else {
    State = {Submitted};
  }
}