Function isPString

isPString(string_: string): string_ is `P${number}`
Tests if a string is a PString. Can also be used as a type guard.
Parameters
- string_: string
  The string to test.
Returns string_ is `P${number}`
True if the string is a PString.
Example
```
const property = 'P123';
   if (!isPString(property)) {
       throw new Error('Not a PString');
   }
   WikibaseItemSnak.fromID(property, 'Q123');
```
- Defined in utils/guards/strings.ts:40