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Language/Type: General regular expressions
Author: Melissa Hovik (on 2018/06/01)

Write a regular expression that will match each of the following patterns:

Strings that contain the words "coffee", "mocha", or "green tea" containing no digits or special characters (space characters should be accepted). Your pattern should ignore letter-casing.
Strings that contain "cat" or "dog" but not both (ignoring letter-casing)

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