cssSelector or xpath in java selenium

I am using Selenium in java and I am trying to get all fields from a web page that are not marked as optional. I  am trying to see if a single cssSelector will work to grab all fields not marked as required. Here is and example of a required field

<div class="form-group" id="account-name-wrapper">
    <label label-default="label-default" class="control-label col-md-3" for="account-name">
        Account Name
    </label>
    <div class="col-md-3">
        <input id="account-name" class="form-control" name="account.name" placeholder="Name" type="text">
        <span class="help-block hidden" id="account-name-help"></span>
    </div>
</div>

And this is an example of an optional field
<div class="form-group" id="account-code-wrapper">
    <label label-default="label-default" class="control-label col-md-3" for="account-code">
        Alpha Code
    </label>
    <div class="col-md-3">
        <input id="account-code" class="form-control" maxlength="10" name="account.code" placeholder="XYZ" type="text">
         <span class="help-block hidden" id="account-code-help"></span>
    </div>
    <div class="col-md-3">
          <span>optional</span>
    </div>
</div>


As you can see the optional field has an extra element:
div class="col-md-3">
          <span>optional</span>
    </div>

Is there a single cssSelector or xpath I can use that will get me all div elements with the class set to form-group?

Thanks
atxmanAsked:
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gurpsbassiCommented:
try this selector:

//div[@class="form-group" and not (descendant::span/text()="optional")]

will give you back all the divs with class "form-group" that don't have a optional child element.
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