Script correction for validating email text field

[coder10]

Hi,
Can anyone make me understand in JavaScript what is all which are in bold, I need simple function to validate a text-field on a form that is to hold an email address. The below in bold is complex for me to understand. Please make correction or provide new function.

<script type="text/javascript">	
	
		function validateEmail(Form) 
		{
		[B]if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(Form.emailAddr.value))[/B]
		{
		alert("Valid Email Address");
		return (true)
		}
		alert("Invalid E-mail Address!")
		return (false)
		}  
	//-->
	</script>

[Dormilich]

that’s one of the simpler email RegExp that the input is tested against

[coder10]

Thanks for the reply, i hope that is Javascript right? i found script from w3school as follows
What is the difference between the earlier one and this one,

<script type="text/javascript">
function validate_email(field,alerttxt)
{
with (field)
  {
  apos=value.indexOf("@");
  dotpos=value.lastIndexOf(".");
  if (apos<1||dotpos-apos<2)
    {alert(alerttxt);return false;}
  else {return true;}
  }
}

function validate_form(thisform)
{
with (thisform)
  {
  if (validate_email(email,"Not a valid e-mail address!")==false)
    {email.focus();return false;}
  }
}
</script>
</head>