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<html>
<head><script>function check()
{
if(document.getElementById("txt").value.match("^[0]$|^[0][.]\\d{1,2}$|^[1-9]{1}\\d{0,11}$|^[1-9]{1}\\d{0,11}[.]\\d{1,2}$"))
{alert("success");}
else{alert("failure");}
}
</script></head>
<body>
<form name="theform">
<input type="text" id="txt"><input type="button" onClick="check();" value="submit">
</form>
</body>
</html>
var regex=/^[-+]?\d+(?:\.\d{1,2})?$/ig;
var regex=/^\d+(?:\.\d{1,2})?$/ig;
/^(0|[1-9]\d*)(\.\d{1,2})?$/