title: Google spreadsheet text length validation
body: <p>I am working on Google spreadsheet. I am trying to make a validation rule on the text length.
  For example the text length must be equal to 12 characters which includes number, on dash and one capital character.
  Example:
  123-56C89112</p>
  
  <p>I tried to search in google groups but no result! can you help in this please </p>