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I want to make sure that the email address entered by the user contains @ and . using RegExp.

This is my code:

var patt = new RegExp("@"); var pattresult = patt.test(document.getElementById("email").value); if (pattresult != true){ errMsg += "Enter a valid Email Address."; result = false; }

Working fine so far only for @. How can I add . in the same pattern?

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Try this, I have tested it. 

var mail=document.getElementById("email").value; var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/; if (!filter.test(mail) && mail!="") { alert('Enter a valid Email Address.') }
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