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I want to check for null or empty field in fql query , I want to add condition to retrieve result when is column not equal empty or null, I've tried these ways :

     <Context>
     <QueryText language='en-US' type='FQL'>and(string("Text"),not(Column_Name:equals(" ")))
     </QueryText>
  </Context>


     <Context>
     <QueryText language='en-US' type='FQL'>and(string("Text"),filter(Column_Name:not(" ")))
     </QueryText>
  </Context>

I also tried "^$" regular expression instead of empty string , but doesn't work .

any ideas ??

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