XPost: comp.programming   
   From: rickNOSPAMnews@NOSPAMcomcast.net   
      
   > Is not:  Not Value Like "*[!0-9]*" ... redundant?   
      
   No, it is not redundant. You can't test directly like this   
      
         Value Like "*[!0-9]*"   
      
   because that would match any **single** digit, no matter where it is located   
   and no matter what the other characters are (digits or not). The only way to   
   handle this, as you found out, is with the "double negative" approach. For a   
   string to be composed of all digits, no one of them can be a non-digit. So   
   we check for that non-digit-ness. And if it is False, then the string is   
   composed of only digits characters. But we don't want to return False   
   through the function, so we NOT the expression to turn False into True for   
   return through the function. As for syntax, the exclamation mark within the   
   squared brackets says "match all characters **except** for those that   
   follow".   
      
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