gistfile1.js

var root = app.activeDocument;
var result = getStyleByString(root, "Formatgruppe 2:Form\\:atgruppe 1:Zeichen\\:\\:format 1", "characterStyles");
$.bp();


function getStyleByString(root, string, property) {
	stringResult = string.match (/^(.*?[^\\]):(.*)$/);
	var cStyleName = (stringResult) ? stringResult[1] : string;
	cStyleName =  cStyleName.replace (/\\:/g, ":");
	remainingString = (stringResult) ? stringResult[2] : "";
	var newProperty = (stringResult) ? property.replace(/s$/, '') + "Groups" : property;	
	var cStyle = root[newProperty].itemByName(cStyleName);
	if (remainingString.length > 0 && cStyle.isValid) cStyle = getStyleByString (cStyle, remainingString, property);
	return cStyle;
}