Github user britter commented on the pull request:
https://github.com/apache/commons-lang/pull/81#issuecomment-99921440
Hello @eduardomartins-luizalabs,
the following will fail:
```java
assertFalse(WordUtils.containsAllWords("lorem ipsum null dolor sit amet",
"ipsum", null, "lorem", "dolor"));
```
This is because you only check for nulls at index 0 of the input array.
IMHO null is not contained in any string. Have a look at for example
```StringUtils.containsAny(CharSequence, CharSequence...)``` and
adc6bc4104514063b3e8ebe7a301d5dd4bce36d3. Further more I wonder whether we
should let this method operate on CharSequences. WDYT?
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