Wrong count is also accepting in Jquery and accepting keywords any where

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ASP.NET

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jQuery

C#3.5

C#5.0

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Requirement: textbox limit: 25characters, max limit:40char allow
IF text contains {State},count for {State} only is 16,
{City} count 14, {St}=2,{Zip}=5

Problem:
I have written JQuery code for this (below code) but it accepts
1.25chars={City}123456789—correct
2.25charcters=1234567891245678{City}-wrong- but it also accepting this one
3.25-chareacters=123456789123456789{City}---wrong- but it also accepting this one




1 dropdown:MainContent_ddlSelectAdLine Options: HeadLine

1 Textbox: MainContent_txtAdline onkeyup=”
<input name="ctl00$MainContent$txtAdline" type="text" id="MainContent_txtAdline" onkeyup="getBatch(event);" style="border-style:Inset;width:85%;" maxlength="50">

1 Span: MainContent_lblCount—for charcters Counting
50

Jquery Code:

function getBatch(e) {
            debugger;
            var len=0; 
            var cnt = $("#MainContent_txtAdline").val();
            var count = $("#MainContent_txtAdline").val().length;

            if (cnt.indexOf("{City}") > -1) 
   {len = 16;$("#MainContent_lblCount").html(16);count = count-6+len}
            else if (cnt.indexOf("{State}") > -1) { len = 14;  count = count - 7 + len }
            else if (cnt.indexOf("{St}") > -1) { len = 2; count = count - 4 + len }
            else if(cnt.indexOf("{Zip}")>-1){len=5; count=count-5+len}
            else { len = 0; count=count+len}     
           

            if (count <= 0) {
                count = 0;
            }
           
            var ddlslectedText = $("#MainContent_ddlSelectAdLine option:selected").text();
            if (ddlslectedText == "HeadLine") {
                if (cnt.indexOf("{City}") > -1)
 { $("#MainContent_txtAdline").attr('maxlength', '30'); }
                else if (cnt.indexOf("{State}") > -1) 
{ $("#MainContent_txtAdline").attr('maxlength', '30'); }
                else if (cnt.indexOf("{St}") > -1) 
{ $("#MainContent_txtAdline").attr('maxlength', '30'); }
                else if (cnt.indexOf("{Zip}") > -1) 
{ $("#MainContent_txtAdline").attr('maxlength', '40'); }
                else { $("#MainContent_txtAdline").attr('maxlength', '40'); }
               

                               
                if (count > 25) {
                    $("#MainContent_lblCount").html(count).css('color', '#CC0000');
                    
                }
                else { $("#MainContent_lblCount").html(count).css('color', '#000000'); }
            }
            
        }