var cashpledge=$("-sharpcashpledge").val();
var reg = /^\+?(?!0+(\.00?)?$)\d+(\.\d\d?)?$/;
var r = cashpledge.match(reg);
if (r == null) {
alert("");
} else {
window.location.href="__SELF__/cashpledge/"+cashpledge;
} 
is your cashpledge a number, or undefined, so there is no match method
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