How to find string using search in java script

Hi,
I have a string

var str = www.abc.com?<useridentifier>=[@ANaccount]

now in above string i want to search   ?<useridentifier>=[@ANaccount]

I have tried using search below
var str1 = str.search("\\?<useridentifier>=[@ANaccount]");

but this one is not working

can u please correct me above code
mannevenu26Asked:
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Raghu MutalikdesaiSenior Manager in a leading IT Services companyCommented:
Try this way:
var idx = str.indexOf("\\?<useridentifier>=[@ANaccount]");
var str1 = str.substring(idx, str.length - 1);

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0
mannevenu26Author Commented:
var idx = str.indexOf("\\?<useridentifier>=[@ANaccount]"); not getting value getting idx as -1
0
Radek BaranowskiFull-stack Java DeveloperCommented:
do it exactly as in

http://www.experts-exchange.com/Programming/Languages/Scripting/JavaScript/Q_28480214.html#a40208907

var str = "www.abc.com?<useridentifier>=[@ANaccount]";

var check=new RegExp ("[\?<useridentifier>=\[@ANaccount\]]");

//this will output position of "?" for testing purposes
if(check.test(str)==true) alert(str.search('\\?'));
0

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