How to search for "any character" or "not empty values" in a Drupal view exposed filter?
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I want to expose a filter in a view, so the user can search for all the records that contain "any character" or "specific values". For instance: 

On each record there is a field called "PE" where users can specify a number. Not all records has to have a value, so I want to expose a filter where the user can search for all the records with any specific number, or all the records that has a value on the field. 

Is there any way to do such in Drupal 7?

Thanks for any help!