How to check if string contains substring using jQuery-Javascript?

You can check using Javascript .IndexOf() if a string contains substring or not, it returns  Index of substring if it is in a string otherwise it returns 0.

And to Fetch ID from a string you need to create  a regex and .match()

So your complete code combing both questions would be something like this

var msg = "Error,there is no phone number for Id - 1234";

        var id = msg.match(/[\d]+$/); //To get id using .match()
        if (msg.indexOf("Error") >= 0)
        {          
           //Error Found do something
        }
        else
        {
            //Do something else if it is not a error
        }

var str = "Error There is no phon number for Id - 1234";
var res = str.replace("Error", "");
var res = res.replace("There", "");
var res = res.replace("is", "");
var res = res.replace("no", "");
var res = res.replace("phon", "");
var res = res.replace("number", "");
var res = res.replace("for", "");
var res = res.replace("Id", "");
var res = res.replace("-", "");