求一正则表达式

Question

function isEmail(strValue) {
var objRegExp = /^[a-z0-9]([a-z0-9_\-\.]*)@([a-z0-9_\-\.]*)(\.[a-z]{2,4}(\.[a-z]{2}){0,2})$/i;
return objRegExp.test(strValue);
}
if (isEmail("[email protected]")==true)
{
 alert("是个电子邮件！");
}

Answer 1

\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*

Answer 2

String.prototype.isEmail = function ()
{
return (/^[\w\-\.]+[@](?:[\w\-]+[.]){1,2}[\w]{2,4}$/i).test(this);
}alert("[email protected]".isEmail());

Answer 3

<script>
//验证email
  var t="[email protected]";
  var regmail=/^\w+@\w+(\.\w+)*$/g;
  alert(regmail.test(t))
</script>

Answer 4

http://www.regexlib.com/Search.aspx这里是正则表达式库，看你先哪个了