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Javascript Email Checker in ASP.NET

Basically I am trying to have a text box that upon change it checks if a valid email is in place and if so the form is submitted for the user. I would like to improve the regex too to only allow a specific domain but I can't get any regex to work due to every time I use a @ sign it thinks I am trying to use C# code I looked it up and supposedly adding a : fixes it but it hasn't for me and I tried a ; too.

document.getElementById("txtCallerID").onchange = function () {
        var temp = document.getElementById("txtCallerID").value

        if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(temp))
          {
            this.document.submit();
          }
    }

and here is a picture with the error. enter image description here

Have now also tried adding a backslash before the @ to no avail.

enter image description here

Via Active questions tagged javascript - Stack Overflow https://ift.tt/JZcIChS
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