Function isAlphanumericUpper

isAlphanumericUpper(text?: null | string): boolean
Returns whether all the characters in the given text is uppercase alphanumeric
Parameters
- Optionaltext: null | string
  the text to check
Returns boolean
whether all the characters in the given text is uppercase alphanumeric
Author
David Hsing
Example
```
isAlphanumericUpper(undefined);    // false
isAlphanumericUpper('ABC123');    // true
isAlphanumericUpper('abc123');    // false
isAlphanumericUpper('--$$##');    // false
```