GREP search for single line paragraphs, CS3

Question

I need to find all single line paragraphs, apply a paragraph style to them and apply that style's "next style" to the next paragraph.
Is there any way to do this using GREP?
Thanks

Answer 1

This script will do what you ask. Just change the name of the head paragraph to whatever yours is in line 11:
//DESCRIPTION: Apply Head Style to single-line paras with Next Style in Selected Story
(function() {
  if (app.documents.length > 0 &&
        app.selection.length == 1 &&
          app.selection[0].hasOwnProperty("baseline")) {
  var myStory = app.selection[0].parent;
  var myParas = myStory.paragraphs;
  for (var j = myParas.length - 1; j >= 0; j--) {
    if (myParas[j].lines.length == 1) {
      myParas[j].appliedParagraphStyle = "H1";
      try {
        myParas[j+1].appliedParagraphStyle = myParas[j].appliedParagraphStyle.nextStyle;
      } catch(e) {} // last para has one line, so ignore
} else {
   // No document open
   alert("Please select some text and try again.");
To use the script, copy it from here into an ExtendScript Toolkit document (you'll find that in the Adobe Utilities folder). Save the document into an appropriate folder and run the script from the Scripts panel with a live insertion point in the story.
To work out where to save the script, open the Scripts panel and then use Reveal in Explorer to find the User Scripts Panel folder.
If your heading style isn't at the top level in your Styles panel, temporarily move it there.
Dave