Hi ServiceNow Community Developers,

I managed to figure this out using a script, here is a script that I wrote which works well for everything i wanted to validate for in the variable:

function onChange(control, oldValue, newValue, isLoading) {

  if (isLoading || newValue == '') {

  return;

  }

  //Type appropriate comment here, and begin script below

  var cost = g_form.getValue('cost');

  cost = cost.trim();

  // first character should be dollar sign

  var firstChar = cost.substring(0,1);

  if (firstChar != '$') {

  alert ("Please enter cost in $0.00 format");

  g_form.setValue("cost", oldValue);

  return;

  }

  // characters after the $ sign should be numerics

  var costType = isNaN(cost.substring(1));

  if (costType == true) {

  alert ("Please enter cost in $0.00 format");

  g_form.setValue("cost", oldValue);

  return;

  }

  // entered value should have a decimal point

  var num = cost.substring(1);

  if (num.indexOf('.') == -1) {

  alert ("Please enter cost in $0.00 format");

  g_form.setValue("cost", oldValue);

  return;

  }

  // there must be 2 digits only after the decimal

  var decNum = num.substring(num.indexOf('.')+1, num.length);

  if (decNum.length != 2) {

  alert ("Please enter cost in $0.00 format");

  g_form.setValue("cost", oldValue);

  return;

  }

}

If there is a better to write this I will greatly appreciate it but the above script worked for me.

Thanks,

Johannes