original_docstring: Substitute a regular expression which matches no version
          or extension names for None or the empty string.
docstring: Substitute a regular expression which matches no version
  or extension names for None or the empty string.
docstring_tokens: Substitute a regular expression which matches no version or extension names for None or the empty string .
code: def emptyRegex(self, pat):
          """Substitute a regular expression which matches no version
          or extension names for None or the empty string."""
          if not pat:
              return '_nomatch_^'
  
          return pat
code_tokens: def emptyRegex ( self , pat ) : if not pat : return '_nomatch_^' return pat
short_docstring: Substitute a regular expression which matches no version
  or extension names for None or the empty string.
short_docstring_tokens: Substitute a regular expression which matches no version or extension names for None or the empty string .
comment: """Substitute a regular expression which matches no version
          or extension names for None or the empty string."""