Replacing of string using javascript

Question

I want to replace string from "_tr9-9" character from a string and replace them with _id character

Here str is changes only _tr9-0 will be changes dynamically remining will be same

str=Test_User_tr9-0;

Ex:

function (str)
{
   var obj=str 
}

Answer 1

You can use replace

In javascript

var str = "Test_user_tr9-9 to Test_user_id";
str = str.replace('tr9-9','id');

In C#

var str = "Test_user_tr9-9";
var str = str.Replace("_tr9-9", "_id");

Answer 2

In C#

string str = "Test_user_tr9-9";
string str2 = str.Replace("_tr9-9", "_id");

In Javascript

var str = "Test_user_tr9-9";
var str2 = str.replace("_tr9-9", "_id");

Note that both in Javascript and C# strings are immutable objects, so the replace/Replace methods return a new modified string (technically in C# the Replace returns the original string if it doesn't find anything to replace)

Answer 3

In JavaScript:

var index = str.lastIndexOf("_");
var result = str.substring(0, index) + "_id";

jsFiddle: http://jsfiddle.net/fNZkG/