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if i enter more than 2 digits it should not accept and textbox should surely contains % symbol...example:99%...should be in this format
Posted 2-Jan-13 6:53am
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Solution 1

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Solution 2

<meta charset="UTF-8">
<title>ssn Checker</title>
<script type="text/javascript">
var Pattern= (\d+(\.\d+)?%);
function checkPercentage(Percentage){
    if (Pattern.test(Percentage)) {
        alert("VALID Percentage");
    } else {
        alert("INVALID Percentage");
    <form  önsubmit="return false;">
        <input type="text" name="Percentage" size="20">
        <input type="button" value="Check">

Second way, You can use Dotnet validation control(regular expression). Define your regex expression in the properties and Customize it as per your requirement.

Regular expression for your query:

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