ID-CS4 -JS - - Can't find using Grep options - Reg.

Question

Dear All,
  Here I have a doubt about the "Find / Change Grep" in InDesign CS4.
I can find the "Force Line Break" using the Grep options : ([a-zA-Z]*)-\\n([a-zA-Z]*)]
Some time this Grep is working, some time this is not working ...
I don't know what I made the mistakes. Please let me know any one can suggest and modify the below coding.
I supposed to close and re-open the InDesign CS4 and ExtendScript tool, then First time this Grep is working fine...
So I confused this. Please any one can give me a solutions.
//================= Coding ==================//
   var myDoc=  app.activeDocument;
       app.findChangeGrepOptions.includeFootnotes = false;
       app.findChangeGrepOptions.includeHiddenLayers = false;
       app.findChangeGrepOptions.includeLockedLayersForFind = false;
       app.findChangeGrepOptions.includeLockedStoriesForFind = false;
       app.findChangeGrepOptions.includeMasterPages = false;
       app.findGrepPreferences.findWhat = "([a-zA-Z]*)-\\n([a-zA-Z]*)";
         mySearch = app.findGrep();
         for(var myForce =0; myForce<mySearch.length; myForce++)
          app.select(mySearch[myForce]);
          var mySel = app.selection[0];
           myConts = mySel.contents;
          app.select(mySearch[myForce]);
          var mySel = app.selection[0];
           myConts = mySel.contents;
          app.findGrepPreferences = NothingEnum.nothing;
           app.changeGrepPreferences = NothingEnum.nothing;
//=============== End of the Coding ========================//
Please any one can kindly help me....
Thanks & Regards
T.R.Harihara SudhaN

Answer 1

Dear Vaasu Devi,
  Many thanks for your reply...
I found, where I mistaken....
Here My Correct Code :
//================= Coding ==================//
   var myDoc=  app.activeDocument;
       app.findChangeGrepOptions.includeFootnotes = false;
       app.findChangeGrepOptions.includeHiddenLayers = false;
       app.findChangeGrepOptions.includeLockedLayersForFind = false;
       app.findChangeGrepOptions.includeLockedStoriesForFind = false;
       app.findChangeGrepOptions.includeMasterPages = false;
       app.findGrepPreferences.findWhat = "([a-zA-Z]*)-\\n([a-zA-Z]*)";
         mySearch = app.findGrep();
         for(var myForce =0; myForce<mySearch.length; myForce++)
                    app.select(mySearch[myForce]);
                     myConts = mySearch[myForce].contents;
                     $.writeln(myConts);
          app.findGrepPreferences = NothingEnum.nothing;
           app.changeGrepPreferences = NothingEnum.nothing;
//=============== End of the Coding ========================//
app.select() is working fine, meanwhile, I get the selection of the contents. That time only its throw the Error message. So I used to divert, app.select and Select Value of Contents to pass the "myConts" variable then I will do the other funtions.... Now My this time I'm not getting the Errors...
Thanks Once again
Regards
T.R.Harihara SudhaN