Match last line characters

Dear Friends.

I need your help:

My Requirements: How to match 1st line last character, 2nd line last characters and 3rd line last characters?

Example:

Last 1st line character >> a

Last 2nd line character >> a

Last 3rd line character >> a

My code below: (Not working)

var myDocument = app.activeDocument;  
//~ var myLine = app.selection[0].lines;
var myLine = myDocument.stories.everyItem().paragraphs.everyItem().lines.everyItem().getElements();  
for(i=0; i<myLine.length; i++)  
{  
    var myChar;
    if (String(myLine.characters.lastItem().contents).match(/\s/)){
        myChar = myLine.characters.item(myLine.characters.length);
        alert("String matches");
        }
    else{
        myChar = myLine.characters.lastItem(); 
        }
        
    var myCharCon = myChar.contents;
   alert(myCharCon)
    if((String(myLine[2].characters.lastItem(-2)).charCodeAt (0).toString(16)).match(String(myLine[6].characters.lastItem(-2)).charCodeAt (0).toString(16))){
        alert("String matches");
        }
    }

Please suggest friend

Thanks in Advance

KS