Non-empty

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A text is considered "non-empty" if it contains 1 or more characters that are contained within any of the following unicode categories:

  • Ll: Letter, Lowercase
  • Lu: Letter, Uppercase
  • Lt: Letter, Titlecase
  • Lo: Letter, Other
  • Lm: Letter, Modifier
  • Nd: Number, Decimal Digit
  • Pc: Punctuation, Connector. This category includes ten characters, the most commonly used of which is the LOWLINE character (_), u+005F.

http://www.fileformat.info/info/unicode/category/index.htm