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Doc - Avoid error null $contains #551

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2 changes: 2 additions & 0 deletions docs/string-functions.md
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Expand Up @@ -122,6 +122,8 @@ Returns `true` if `str` is matched by `pattern`, otherwise it returns `false`. I

The `pattern` parameter can either be a string or a regular expression (regex). If it is a string, the function returns `true` if the characters within `pattern` are contained contiguously within `str`. If it is a regex, the function will return `true` if the regex matches the contents of `str`.

The parameter `str` is required and cannot be undefined. When the parameter is a variable it is a good practice to wrap it with `$string` to avoid unexpected error.
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It can be undefined. If it is, then the function will return undefined.


__Examples__

- `$contains("abracadabra", "bra")` => `true`
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