You can only get that information, if you selected* some text with that paragraph style.
Here an example:
//To define a GREP Style we need //1. a character style:
var myChStyle = app.activeDocument.characterStyles[0]; //This is Character Style "[None]" //2. a GREP expression as string:
var myGREPString = "\d+"; //3. a paragraph style//For example the applied paragraph style from//the first paragraph of a selected text:
var myAppliedParaStyle = app.selection[0].paragraphs[0].appliedParagraphStyle; //If you want to clear ALL GREP Styles already defined un-comment the following lines: //~ var allGREPStylesArray = myAppliedParaStyle.nestedGrepStyles.everyItem().getElements(); //~ for(var n=allGREPStylesArray.length-1;n>=0;n--){//~ allGREPStylesArray[n].remove();//~ }; //CAUTION: We did not check, if there are already some GREP-Styles defined!//The new GREP Style will be added to previously existing ones. //Now we add a new GREP Style to the paragraph style:
myAppliedParaStyle.nestedGrepStyles.add({ appliedCharacterStyle:myChStyle, grepExpression:myGREPString });
*or found another way to target a piece of text.
Example for the applied character style of the first insertion point of the first text frame on page one of the active document:
myAppliedParaStyle = app.activeDocument.pages[0].textFrames[0].insertionPoints[0].appliedCharacterStyle;
*or you know the paragraph style by name or by index order in the Paragraph Styles Panel.
Example by Name:
myParaStyle = app.activeDocument.paragraphStyles.itemByName("Plain_String_Of_The_Name_If_Not_In_Subdirectory");
Uwe