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Javascript Email Validation

This is example used to validate a textbox which contain a valid or in-valid email address.
Javascript:

function validate() 
 { 
var EmaiAddress=document.getElementById("txtemail").value; var RegExEmail =/\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/;
 if (!RegExEmail.test(EmaiAddress)) 
 {
 alert("Please Enter Valid E-mail Adress"); 
 document.form1.txtemail.focus();
 return false; 
 } 
else 
{
 alert("Valid Email"); 
 }
 } 

Html Code:

<input type="text" id="txtemail"  />
<input type="button"  onclick="return validate();"/> 

  Demo:

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