Function contains

contains(target: string, contained: string): Result<boolean | undefined>
Test whether the target string contains the contained string.

Example
```
expect(contains('foobar', 'foo').value).toBeTruthy()
```
Parameters
- target: string
  
  The string that should contain the element
- contained: string
  
  The possibly contained string
Returns Result<boolean | undefined>
- Defined in validators/contains.ts:30

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