<!--javascript 正则表达式应用--><html><head>
<script language="javascript">
function check_it()
{ var validFormatRegExp = /^\w(\.?\w)*@\w(\.?[-\w])*\.([a-z]{3}(\.[a-z]{2})?|[a-z]{2}(\.[a-z]{2})?)$/i; var email_test=document.f1.t1.value; if (validFormatRegExp.test(email_test)) { window.alert("OK"); return true;
} else { window.alert("Email invalid. please try again "); return false; }
}</script></head><body><form name="f1" id="f1" onSubmit="return check_it()">Enter your e-mail address:<br><input type="text" name="t1" id="t1"><br><input type="submit"></form></body></html>
