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<input name="haha">
<input name="re" value="\d+">
<input name="button1" type="button" value="test" onclick="show(document.getElementById('re').value,document.getElementById('haha').value)">
<script language=javascript>
function show(validChar,inputValue){
var regexStr="^"+validChar+"$";
var regex=new RegExp(regexStr);
alert(regex.test(inputValue));
}
</script>
<input name="haha">
<input name="button1" type="button" value="test" onclick="show('\\d+',document.getElementById('haha').value)">
<script language=javascript>
function show(validChar,inputValue){
var regexStr="^"+validChar+"$";
var regex=new RegExp(regexStr);
alert(regex.test(inputValue));
}
</script>