Function isSubString

isSubString(contained: string, target: string): Result<boolean | undefined>
Checks if the value is a substring of the target.

Example
```
expect(isSubString('foo', 'fooboo').value).toBeTruthy()
```
Parameters
- contained: string
  
  The value that may be contained.
- target: string
  
  The target value to perform the check against.
Returns Result<boolean | undefined>
- Defined in validators/isSubString.ts:29

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