Function isAlphanumericLower

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