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Checking an email address - Version 02

< html> <head> <title>Checking an email address - Version 02</title> <script type="text/javascript" language="javascript"> <!-- // function IsMatchingAddress(str){     var myRegExp = /[a-z0-9-.]{1,30}@[a-z0-9-]{1,65}.(com|net|org|info|biz|([a-z]{2,3}.[a-z]{2}))/ ;     return myRegExp.test(str) } function TestGuess(){     var EmailAddr = "asdf@rntsoft.com".toLowerCase();     alert(IsMatchingAddress(EmailAddr)); } // --> </script> </head> <body> <h3>This page allows you to enter and check an email address  such as asdf@rntsoft.com,</h3> <form> <button type="Button" onclick="TestGuess()"> Click here to enter email address</button> </form> </body> </html>