This this instead. The RegEx in the other example is incorrect.
function onChange(control, oldValue, newValue, isLoading, isTemplate) {
if (isLoading || newValue === '') {
return;
}
var regexp = /^[\d\.]+$/;
if(!regexp.test(newValue)) {
alert('Only numbers and dot allowed');
g_form.setValue('u_fieldname','');
}
}
