How to find special character in Java Script

I have string


in above string i want to find out '?'

How to find '?' is present in above string.if present how to identify index of that '?'.
can u plz give me javascript code for this
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Radek BaranowskiFull-stack Java DeveloperCommented:

var str = "welcome?page#isexperts";
var n ="\\?");

n contains the position of your searched character in the string (accounted for the fact that first character has index=0)
mannevenu26Author Commented:
getting error Microsoft JScript runtime error: Unexpected quantifier.

Both i triewd with / and without /
Radek BaranowskiFull-stack Java DeveloperCommented:
you mean " \ " ??

the direction is quite important here, I'm talking backslash
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Radek BaranowskiFull-stack Java DeveloperCommented:
btw I edited my initial answer, so please refresh in browser to see the suggested solution,


var str = "welcome?page#isexperts";
var n ="\\?");

n contains the position of your searched character in the string (accounted for the fact that first character has index=0)
You can find out "? exist or not by RegExp pattern, take a look the follow code for reference only, and seach the position as the last post mentioned
<meta http-equiv="Content-Type" content="text/html; charset=Big5">
<script type="text/javascript">
function init()
var check=new RegExp ("[\?]");
if(check.test(str)==true) alert('\\?'));
alert( "No such character");
<script type="text/javascript"></script>
<body  onload="javascript:init()" >

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