Re: test if a string is a valid 'number'?

Point taken. I didn't know his strings would be that complex. I guess the
only way to do it completely would be to loop through the string. I suppose
you could do something like (I just wrote this out, didn't really test it,
but you get the idea):

bool IsANumber(const CString& cs)
{
   LPCTSTR szTest = cs;
   bool bFoundDot = *szText == _T('.');
   bool bNum = true;

   //If we have a + or - it should be in the first position. Also could be
decimal point or a number
   if ((*szTest > _T('9') || *szTest < _T('0')) && *szTest != _T('-') &&
*szText != _T('+') && !bFoundDot)
         bNum = false;

   ++szTest;
   while (bNum && *szTest) {
      // We only want one decimal point
      if(!bFoundDot && *szTest != _T('.'))
           bFoundDot = true;
      else if (*szTest > _T('9') || *szTest < _T('0')) {
         bNumeric = false;
         break;
      }
      ++szTest;
   }

   return bNum;
}

Of course you could add a lot ot this for other kinds of tests (like
scientific notation. If you already have reg ex in your code then your way
is likely better.

Tom

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