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< html> <head> <title>Matching a sequence of literal characters</title> <script type="text/javascript" language="javascript"> <!-- // function IsMatchingCode(str){     var myRegExp = /[A-Z][0-9]/ ;     return myRegExp.test(str) } function TestGuess(){     alert(IsMatchingCode("a3")); } // --> </script> </head> <body> <form> <button type="Button" onclick="TestGuess()">Click here to guess</button> </form> </body> </html>