Regular Expression question

I need to obtain a Regular expression pattern which will do the following-
Given an input string, return true if it contains the words APPLE and/or ORANGE but not the word MANGO. The words may appear in any order in the string.

Input : " I like APPLE and MANGO"        Output : False
Input : "I like APPLE and ORANGE"        Output : True
Input : "I like ORANGE"                          Output : True
Input : "I like MANGO"                           Output : False
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Obadiah ChristopherCommented:
Try this
CuteBugAuthor Commented:
In this case, the first example will fail (as APPLE is present and so is MANGO, in which case it should have returned false)
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Regex re = new Regex(@"(?=.*(APPLE|ORANGE))(?!.*MANGO).*",RegexOptions.Singleline);

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And with the addition of the ^ and $ for string boundaries.
Regex re = new Regex(@"^(?=.*(APPLE|ORANGE))(?!.*MANGO).*$",RegexOptions.Singleline);

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CuteBugAuthor Commented:
Thanks a lot!
Thanks for the question and the points.
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