Function alphanumeric

alphanumeric(text: string): string
Returns a copy of the given string with all non-alphanumeric characters removed, except for spaces. Letters and digits are preserved regardless of case.
Parameters
- text: string
Returns string
Remarks
This is null | undefined safe. If you pass null | undefined then this will return "".
Example
```
alphanumeric(null); // ""
alphanumeric("Hello, World!"); // "Hello World"
alphanumeric("123@#Test"); // "123Test"
```
- Defined in strings.ts:145