Q1740 How can I filter user input to leave just the numerical digits?

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Q1740 How can I filter user input to leave just the numerical digits?

Use a Regular Expression:

<html>

<body>

<script language="JavaScript"><!--
var temp = prompt('Enter a number','23408fn2fy28fh398f928');
temp = temp.replace(/[^0-9]/g,'');
alert(temp);
//--></script>

</body>

</html>

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